Blood Vessels And Circulation: Quiz! Test
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Questions and Answers
- 1.
Select all of the functions of the peripheral circulation.
- A.
Carries blood
- B.
Pumps blood
- C.
Exchanges nutrients, waste products, and gases with tissues
- D.
Transports substances
- E.
Eliminates foreign particles in blood
- F.
Helps regulate blood pressure
- G.
Directs blood flow to tissues
- H.
Circulates blood to heart
Correct Answer(s)
A. Carries blood
C. Exchanges nutrients, waste products, and gases with tissues
D. Transports substances
F. Helps regulate blood pressure
G. Directs blood flow to tissuesExplanation
The peripheral circulation performs several functions. It carries blood throughout the body, allowing for the transportation of oxygen, nutrients, hormones, and waste products. It also facilitates the exchange of these substances with the tissues, ensuring that cells receive what they need and get rid of what they don't. The peripheral circulation helps regulate blood pressure by adjusting the diameter of blood vessels and directing blood flow to different tissues as needed. Overall, it plays a crucial role in maintaining homeostasis and supporting the proper functioning of organs and tissues.Rate this question:
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- 2.
_________ are blood vessels that carry blood away from the heart.
- A.
Arteries
- B.
Veins
- C.
Capillaries
- D.
Ventricles
Correct Answer
A. ArteriesExplanation
Arteries are blood vessels that carry blood away from the heart. They have thick, muscular walls that allow them to withstand the high pressure generated by the heart's pumping action. Arteries transport oxygenated blood from the heart to various parts of the body, delivering nutrients and oxygen to the tissues. They then carry deoxygenated blood back to the heart, where it is pumped to the lungs for oxygenation. Veins, on the other hand, carry blood back to the heart, capillaries are tiny blood vessels that connect arteries and veins, and ventricles are the lower chambers of the heart.Rate this question:
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- 3.
__________ are blood vessels that carry blood towards the heart.
- A.
Arteries
- B.
Arterioles
- C.
Venules
- D.
Veins
Correct Answer
D. VeinsExplanation
Veins are the correct answer because they are blood vessels that carry blood towards the heart. Arteries carry blood away from the heart, arterioles are smaller branches of arteries, and venules are smaller branches of veins. Therefore, veins are the only option that accurately describes blood vessels that carry blood towards the heart.Rate this question:
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- 4.
What is the route of blood flow from the heart through the systemic circulation?
- A.
Aorta, arteries, arterioles, venules, veins, capillaries
- B.
Venules, veins, capillaries, arterioles, arteries, aorta
- C.
Aorta, arteries, arterioles, capillaries, venules, veins
- D.
Aorta, capillaries, arteries, arterioles, venules, veins
Correct Answer
C. Aorta, arteries, arterioles, capillaries, venules, veinsExplanation
The correct answer is aorta, arteries, arterioles, capillaries, venules, veins. This is the correct route of blood flow from the heart through the systemic circulation. The blood is pumped out of the heart into the aorta, which is the largest artery in the body. From there, it travels through smaller arteries, then arterioles, which are even smaller vessels. The blood then enters the capillaries, where oxygen and nutrients are exchanged with the surrounding tissues. After leaving the capillaries, the blood enters venules, which are small veins, and then continues to larger veins, eventually returning to the heart.Rate this question:
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- 5.
Which blood vessels allow the exchange of gases and nutrients between the blood and tissues?
- A.
Capillaries
- B.
Arteries
- C.
Venules
- D.
Veins
Correct Answer
A. CapillariesExplanation
Capillaries are the smallest blood vessels in the body and are responsible for the exchange of gases and nutrients between the blood and tissues. Their thin walls allow for easy diffusion of oxygen, carbon dioxide, and other nutrients, ensuring that these substances reach the cells and waste products are removed. Arteries carry oxygenated blood away from the heart, while veins carry deoxygenated blood back to the heart. Venules are small veins that collect blood from capillaries and drain into larger veins. Therefore, the correct answer is capillaries.Rate this question:
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- 6.
What is the tunica media composed of?
- A.
Simple squamous epithelium
- B.
Smooth muscle
- C.
Connective tissue
- D.
Elastic cartilage
Correct Answer
B. Smooth muscleExplanation
The tunica media is a layer of tissue found in the walls of blood vessels. It is responsible for regulating blood flow and maintaining blood pressure. The correct answer is smooth muscle because the tunica media is primarily composed of smooth muscle cells. These cells are arranged in a circular fashion and can contract and relax to control the diameter of the blood vessel, allowing for the adjustment of blood flow.Rate this question:
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- 7.
What is the tunica adventitia composed of?
- A.
Simple squamous epithelium
- B.
Smooth muscle
- C.
Connective tissue
- D.
Stratified epithelium
Correct Answer
C. Connective tissueExplanation
The tunica adventitia is composed of connective tissue. Connective tissue is a type of tissue that provides support and structure to the body. It consists of cells embedded in an extracellular matrix, which is made up of fibers and ground substance. The tunica adventitia is the outermost layer of a blood vessel or organ, and it helps to anchor and protect the structure. Connective tissue is well-suited for this role due to its strength and flexibility.Rate this question:
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- 8.
Muscular arteries, which are medium-sized arteries that regulate blood flow to the organs are....?
- A.
Arterioles
- B.
Distributing arteries
- C.
Venules
- D.
Elastic arteries
Correct Answer
B. Distributing arteriesExplanation
Distributing arteries, also known as muscular arteries, are medium-sized arteries that play a crucial role in regulating blood flow to various organs. They have a thick layer of smooth muscle in their walls, allowing them to constrict or dilate to control the amount of blood reaching specific tissues or organs. This ability to regulate blood flow helps maintain proper functioning of the organs and ensures that they receive an adequate supply of oxygen and nutrients. Therefore, distributing arteries are the correct answer in this case.Rate this question:
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- 9.
What structures carry blood from arterioles to venules?
- A.
Capillaries
- B.
Thoroughfare channels
- C.
Precapillary sphincters
- D.
Large venules
Correct Answer
B. Thoroughfare channelsExplanation
Thoroughfare channels are the structures that carry blood from arterioles to venules. These channels provide a direct connection between the arterioles and venules, bypassing the capillaries. They allow for the continuous flow of blood and help regulate blood pressure. Capillaries are the smallest blood vessels and are responsible for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Precapillary sphincters are circular muscles that regulate blood flow into capillaries. Large venules are the vessels that receive blood from the capillaries and carry it back to the heart.Rate this question:
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- 10.
What condition results from a loss of elasticity in the aorta, large arteries, and coronary arteries?
- A.
Atherosclerosis
- B.
Arteriosclerosis
Correct Answer
B. ArteriosclerosisExplanation
Arteriosclerosis is the correct answer because it refers to the condition that occurs when there is a loss of elasticity in the aorta, large arteries, and coronary arteries. This condition is characterized by the hardening and narrowing of the arteries, which can lead to reduced blood flow and potential complications such as heart disease and stroke. Atherosclerosis, on the other hand, specifically refers to the buildup of plaque in the arteries, which is a common cause of arteriosclerosis.Rate this question:
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- 11.
What condition is caused by the deposition of materials in arterial walls for plaques?
- A.
Atherosclerosis
- B.
Arteriosclerosis
Correct Answer
A. AtherosclerosisExplanation
Atherosclerosis is a condition caused by the deposition of materials, such as cholesterol and fatty substances, in the arterial walls, forming plaques. These plaques can build up over time, narrowing and hardening the arteries, which can lead to various cardiovascular problems. Arteriosclerosis, on the other hand, refers to the general thickening and hardening of the arterial walls, which can also contribute to the development of atherosclerosis. However, atherosclerosis specifically refers to the formation of plaques in the arterial walls.Rate this question:
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- 12.
What is the function of pulmonary circulation?
- A.
Move blood to and from lungs
- B.
Move blood to and from heart
- C.
Move blood to and from rest of body
- D.
Move blood to and from the ventricles
Correct Answer
A. Move blood to and from lungsExplanation
The function of pulmonary circulation is to move blood to and from the lungs. This is important because it allows for the exchange of oxygen and carbon dioxide in the lungs, ensuring that oxygenated blood is delivered to the rest of the body and deoxygenated blood is returned to the lungs to be oxygenated again.Rate this question:
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- 13.
Arteries carry blood from the _____________ of the heart to all parts of the body.
- A.
Right ventricle
- B.
Right aorta
- C.
Left ventricle
- D.
Left aorta
Correct Answer
C. Left ventricleExplanation
The left ventricle is responsible for pumping oxygenated blood out of the heart and into the arteries. Arteries are blood vessels that carry oxygenated blood away from the heart to supply oxygen and nutrients to all parts of the body. Therefore, the correct answer is left ventricle as it accurately describes the direction of blood flow from the heart to the arteries.Rate this question:
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- 14.
The brachiocephalic artery branches at the clavicle to for the right common carotid artery which transports blood to.....?
- A.
Left upper limb
- B.
Left head and neck
- C.
Right upper limb
- D.
Right head and neck
Correct Answer
D. Right head and neckExplanation
The brachiocephalic artery, which is a major branch of the aorta, divides into several arteries including the right common carotid artery. The right common carotid artery is responsible for transporting blood to the right side of the head and neck. Therefore, the correct answer is "right head and neck".Rate this question:
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- 15.
What does the right subclavian artery supply?
- A.
Left upper limb
- B.
Left head and neck
- C.
Right upper limb
- D.
Right head and neck
Correct Answer
C. Right upper limbExplanation
The right subclavian artery supplies blood to the right upper limb. The subclavian artery is a major blood vessel that arises from the aorta and branches off to supply blood to various regions of the body. In this case, it specifically provides oxygenated blood to the right upper limb, including the arm, forearm, and hand.Rate this question:
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- 16.
What do the external carotid arteries supply?
- A.
Structures of the neck, face, nose, and mouth
- B.
Structures of the head and neck
- C.
Left side of head
- D.
Right side of neck
Correct Answer
A. Structures of the neck, face, nose, and mouthExplanation
The external carotid arteries supply blood to the structures of the neck, face, nose, and mouth. These arteries are responsible for delivering oxygenated blood to these areas, allowing them to function properly. The structures in the neck, face, nose, and mouth rely on the external carotid arteries for their blood supply, which is essential for their overall health and functioning.Rate this question:
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- 17.
What structures branch from the aorta to supply the heart?
- A.
Capillaries
- B.
Coronary veins
- C.
Coronary arteries
- D.
Vertebral arteries
Correct Answer
C. Coronary arteriesExplanation
The correct answer is coronary arteries. The coronary arteries branch from the aorta to supply the heart with oxygenated blood. These arteries play a crucial role in delivering nutrients and oxygen to the cardiac muscle, ensuring its proper functioning. Capillaries are tiny blood vessels that connect arteries and veins, and they are not specific to the heart. Coronary veins drain deoxygenated blood from the heart, while vertebral arteries supply blood to the brain.Rate this question:
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- 18.
What arteries branch from the left subclavian arteries?
- A.
Capillary arteries
- B.
Coronary arteries
- C.
Vertebral arteries
- D.
Basilar arteries
Correct Answer
C. Vertebral arteriesExplanation
The vertebral arteries branch from the left subclavian artery. These arteries supply blood to the spinal cord, brainstem, and cerebellum. They travel through the vertebrae in the neck and join together to form the basilar artery, which supplies blood to the posterior part of the brain.Rate this question:
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- 19.
The vertebral arteries supply blood to the.....?
- A.
Spinal cord
- B.
Vertebrae
- C.
Muscles and ligaments in the neck
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The vertebral arteries are responsible for supplying blood to various structures in the neck region. They provide blood to the spinal cord, which is essential for its proper functioning. Additionally, they also supply blood to the vertebrae, ensuring their nourishment and health. Furthermore, the muscles and ligaments in the neck receive blood supply from the vertebral arteries, enabling their performance and flexibility. Therefore, the correct answer is "all of the above" as the vertebral arteries supply blood to the spinal cord, vertebrae, and muscles and ligaments in the neck.Rate this question:
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- 20.
What do the internal carotid arteries supply?
- A.
Brain
- B.
Neck
- C.
Head
- D.
Spinal cord
Correct Answer
A. BrainExplanation
The internal carotid arteries supply blood to the brain. These arteries are responsible for delivering oxygen and nutrients to the brain tissue, allowing it to function properly. Without the internal carotid arteries, the brain would not receive the necessary blood supply, leading to severe complications and potentially life-threatening conditions.Rate this question:
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- 21.
The subclavian artery continues, without branching, as the _______ artery, and then as the _______ artery.
- A.
Brachial/axillary
- B.
Axillary/brachial
- C.
Axillary/mid cutaneous
- D.
Brachial/cubital
Correct Answer
B. Axillary/brachialExplanation
The subclavian artery continues, without branching, as the axillary artery, and then as the brachial artery. The axillary artery is a continuation of the subclavian artery in the armpit region, while the brachial artery is a continuation of the axillary artery in the upper arm.Rate this question:
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- 22.
The brachial artery divides into what two arteries?
- A.
Ulnar and cubital
- B.
Ulnar and palmar
- C.
Palmar and radial
- D.
Ulnar and radial
Correct Answer
D. Ulnar and radialExplanation
The brachial artery is a major blood vessel in the upper arm. It divides into two main branches, namely the ulnar artery and the radial artery. The ulnar artery supplies blood to the ulnar side of the forearm and hand, while the radial artery supplies blood to the radial side of the forearm and hand. Therefore, the correct answer is ulnar and radial.Rate this question:
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- 23.
What does the radial artery supply?
- A.
Superficial palmar arch
- B.
Deep palmar arch
- C.
Digital arteries
- D.
Both a & b
Correct Answer
B. Deep palmar archExplanation
The radial artery supplies the deep palmar arch. The deep palmar arch is an important arterial network located in the palm of the hand. It provides blood supply to the deep structures of the hand, including the muscles, tendons, and joints. The radial artery is one of the major arteries that contribute to the formation of the deep palmar arch, along with the ulnar artery. Therefore, the correct answer is deep palmar arch.Rate this question:
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- 24.
What does the ulnar artery supply?
- A.
Superficial palmar arch
- B.
Deep palmar arch
- C.
Digital arteries
- D.
Both a & b
Correct Answer
A. Superficial palmar archExplanation
The ulnar artery supplies the superficial palmar arch. This is a network of blood vessels located in the palm of the hand, which provides blood to the fingers and the superficial structures of the hand. The deep palmar arch, on the other hand, is supplied by the radial artery. The digital arteries are branches of the superficial palmar arch and provide blood to the fingers. Therefore, the correct answer is the superficial palmar arch.Rate this question:
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- 25.
What branch of the thoracic aorta supplies the thoracic organs?
- A.
Parietal branches
- B.
Visceral branches
- C.
Thoracic branches
- D.
None of the above
Correct Answer
B. Visceral branchesExplanation
The visceral branches of the thoracic aorta supply the thoracic organs. These branches are responsible for delivering oxygenated blood to the organs within the thoracic cavity, including the heart, lungs, esophagus, and other surrounding structures. The parietal branches, on the other hand, supply the walls and tissues of the thoracic cavity itself. The term "thoracic branches" is not specific enough to accurately describe which organs are being supplied. Therefore, the correct answer is visceral branches.Rate this question:
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- 26.
What are the unpaired branches of the abdominal aorta?
- A.
Celiac trunk, superior mesenteric artery, inferior mesenteric artery
- B.
Splenic artery, left gastric artery, common hepatic artery
- C.
Renal arteries, suprarenal arteries, gonadal arteries
- D.
Inferior phrenic arteries, lumbar arteries, median sacral artery
Correct Answer
A. Celiac trunk, superior mesenteric artery, inferior mesenteric arteryExplanation
The correct answer is celiac trunk, superior mesenteric artery, inferior mesenteric artery. These are the unpaired branches of the abdominal aorta because they are the only arteries that arise from the abdominal aorta as single vessels, without a corresponding pair on the opposite side. The other options listed in the question have paired branches, such as the splenic artery and left gastric artery, which are both branches of the celiac trunk. The renal arteries, suprarenal arteries, and gonadal arteries are also paired branches, as are the inferior phrenic arteries, lumbar arteries, and median sacral artery.Rate this question:
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- 27.
What are the branches of the celiac trunk?
- A.
Celiac trunk, superior mesenteric artery, inferior mesenteric artery
- B.
Splenic artery, left gastric artery, common hepatic artery
- C.
Renal arteries, suprarenal arteries, gonadal arteries
- D.
Inferior phrenic arteries, lumbar arteries, median sacral artery
Correct Answer
B. Splenic artery, left gastric artery, common hepatic arteryExplanation
The branches of the celiac trunk are the splenic artery, left gastric artery, and common hepatic artery. These arteries supply blood to various organs in the abdominal region. The splenic artery supplies blood to the spleen, while the left gastric artery supplies blood to the lesser curvature of the stomach. The common hepatic artery further divides into the proper hepatic artery and the gastroduodenal artery, which supply blood to the liver and the stomach, respectively. Therefore, the correct answer is splenic artery, left gastric artery, common hepatic artery.Rate this question:
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- 28.
What are the paired branches of the abdominal aorta?
- A.
Celiac trunk, superior mesenteric artery, inferior mesenteric artery
- B.
Splenic artery, left gastric artery, common hepatic artery
- C.
Renal arteries, suprarenal arteries, gonadal arteries
- D.
Inferior phrenic arteries, lumbar arteries, median sacral artery
Correct Answer
C. Renal arteries, suprarenal arteries, gonadal arteriesExplanation
The correct answer is renal arteries, suprarenal arteries, gonadal arteries. The paired branches of the abdominal aorta include the renal arteries, which supply blood to the kidneys; the suprarenal arteries, which supply blood to the adrenal glands; and the gonadal arteries, which supply blood to the reproductive organs (ovaries in females and testes in males). These branches play a crucial role in supplying oxygenated blood to these organs and maintaining their proper function.Rate this question:
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- 29.
The abdominal aorta divides into two _______ arteries.
- A.
Common iliac
- B.
External iliac
- C.
Internal iliac
- D.
Femoral
Correct Answer
A. Common iliacExplanation
The abdominal aorta is a major blood vessel that supplies oxygenated blood to the lower part of the body. It divides into two common iliac arteries, which further branch out into the external iliac artery and internal iliac artery. The common iliac arteries are responsible for supplying blood to the pelvis, lower abdominal organs, and lower limbs. Therefore, the correct answer is common iliac.Rate this question:
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- 30.
The external iliac artery continues, without branching, as the ______ artery and then as the _______ artery.
- A.
Popliteal/femoral
- B.
Femoral/anterior tibial
- C.
Femoral/popliteal
- D.
Popliteal/fibular artery
Correct Answer
C. Femoral/poplitealExplanation
The external iliac artery continues as the femoral artery and then as the popliteal artery. The femoral artery is a major artery in the thigh that supplies blood to the lower limb, while the popliteal artery is located behind the knee and provides blood to the lower leg and foot.Rate this question:
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- 31.
What major vein returns blood from the head, neck, thorax, and upper limbs to the right atrium of the heart?
- A.
Inferior vena cava
- B.
Superior vena cava
- C.
Coronary sinus
- D.
Great saphenous vein
Correct Answer
B. Superior vena cavaExplanation
The superior vena cava is the major vein that returns blood from the head, neck, thorax, and upper limbs to the right atrium of the heart. It is responsible for carrying deoxygenated blood from the upper body back to the heart for oxygenation. The inferior vena cava, on the other hand, returns blood from the lower body to the right atrium. The coronary sinus is a smaller vein that drains blood from the heart muscle itself, while the great saphenous vein is a superficial vein in the lower limb.Rate this question:
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- 32.
What major vein returns blood from the abdomen, pelvis, and lower limbs to the right atrium?
- A.
Inferior vena cava
- B.
Superior vena cava
- C.
Coronary sinus
- D.
Great saphenous vein
Correct Answer
A. Inferior vena cavaExplanation
The major vein that returns blood from the abdomen, pelvis, and lower limbs to the right atrium is the inferior vena cava. This vein is responsible for carrying deoxygenated blood from the lower part of the body back to the heart. The superior vena cava, on the other hand, returns blood from the upper part of the body to the right atrium. The coronary sinus is a vein that collects blood from the heart muscle itself. The great saphenous vein is the longest vein in the body, but it does not directly return blood to the right atrium.Rate this question:
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- 33.
What major vein returns blood from the walls of the heart to the right atrium?
- A.
Superior vena cava
- B.
Cardiac veins
- C.
Coronary sinus
- D.
B & c only
Correct Answer
D. B & c onlyExplanation
The correct answer is "b & c only" because both the cardiac veins and the coronary sinus are responsible for returning blood from the walls of the heart to the right atrium. The cardiac veins collect deoxygenated blood from the myocardium and drain into the larger coronary sinus, which then empties into the right atrium. The superior vena cava, on the other hand, returns blood from the upper body to the right atrium, but it does not specifically return blood from the walls of the heart.Rate this question:
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- 34.
What veins drain the dural venous sinuses and the veins of the anterior head, face, and neck?
- A.
Internal jugular veins
- B.
External jugular veins
- C.
Subclavian veins
- D.
Lingual veins
Correct Answer
A. Internal jugular veinsExplanation
The internal jugular veins drain the dural venous sinuses and the veins of the anterior head, face, and neck. These veins are responsible for carrying deoxygenated blood from these areas back to the heart. The internal jugular veins are located deep within the neck and are the main drainage pathway for the head and neck region.Rate this question:
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- 35.
What veins drain the posterior head and neck?
- A.
Vertebral veins
- B.
Subclavian veins
- C.
External jugular veins
- D.
Both a & c only
Correct Answer
D. Both a & c onlyExplanation
The veins that drain the posterior head and neck are the vertebral veins and the external jugular veins. The vertebral veins drain blood from the spinal cord and the posterior part of the head, while the external jugular veins drain blood from the external structures of the head and neck. Therefore, the correct answer is "both a & c only" because both the vertebral veins and the external jugular veins are responsible for draining the posterior head and neck.Rate this question:
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- 36.
What veins return blood to the superior vena cava?
- A.
Left brachiocephalic vein
- B.
Right brachiocephalic vein
- C.
Azygos veins
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
All of the above veins return blood to the superior vena cava. The left brachiocephalic vein, right brachiocephalic vein, and azygos veins are all major veins that drain deoxygenated blood from the upper body and return it to the superior vena cava, which then carries the blood to the right atrium of the heart.Rate this question:
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- 37.
What veins directly enter the inferior vena cava?
- A.
Hepatic veins
- B.
Lumbar veins
- C.
Gastric veins
- D.
Gonadal veins
- E.
Splenic veins
Correct Answer(s)
A. Hepatic veins
C. Gastric veins
D. Gonadal veinsExplanation
The hepatic veins, gastric veins, and gonadal veins directly enter the inferior vena cava. The hepatic veins drain blood from the liver, the gastric veins drain blood from the stomach, and the gonadal veins drain blood from the reproductive organs. These veins provide a direct pathway for deoxygenated blood to return to the heart via the inferior vena cava.Rate this question:
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- 38.
What veins make up the hepatic portal vein?
- A.
Left gastric vein
- B.
Inferior mesenteric vein
- C.
Hepatic vein
- D.
Splenic vein
- E.
Superior mesenteric vein
- F.
Renal vein
Correct Answer(s)
A. Left gastric vein
B. Inferior mesenteric vein
D. Splenic veinExplanation
The hepatic portal vein is formed by the convergence of three main veins: the left gastric vein, the inferior mesenteric vein, and the splenic vein. These veins collect blood from various organs in the abdominal region and transport it to the liver for processing and detoxification. The left gastric vein drains blood from the stomach, the inferior mesenteric vein drains blood from the lower part of the colon, and the splenic vein drains blood from the spleen. Together, they form the hepatic portal vein, which plays a crucial role in the liver's function in maintaining overall body health.Rate this question:
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- 39.
When are Korotkoff sounds heard?
- A.
When semilunar valves close
- B.
When ventricles are filling with blood
- C.
When atrioventricular valves close
- D.
In artery when measuring BP with a BP cuff
Correct Answer
D. In artery when measuring BP with a BP cuffExplanation
Korotkoff sounds are heard in the artery when measuring blood pressure with a blood pressure cuff. This occurs because the cuff temporarily restricts blood flow in the artery, and as the pressure in the cuff is gradually released, blood begins to flow through the artery again. The Korotkoff sounds are produced by the turbulent flow of blood as it passes through the partially constricted artery. These sounds are used to determine the systolic and diastolic blood pressure values.Rate this question:
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- 40.
What increases as blood travels from the aorta to the capillaries?
- A.
Diffusion
- B.
Pressure
- C.
Viscosity
- D.
Resistance
Correct Answer
D. ResistanceExplanation
As blood travels from the aorta to the capillaries, the resistance increases. This is because the capillaries are smaller in diameter compared to the aorta, resulting in increased friction and resistance to blood flow. The resistance is necessary to slow down the blood flow and allow for efficient exchange of oxygen and nutrients in the capillaries. Therefore, resistance is the factor that increases as blood travels from the aorta to the capillaries.Rate this question:
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- 41.
What increases when the hematocrit increases or plasma volume decreases?
- A.
Resistance
- B.
Pressure
- C.
Viscosity
- D.
Blood vessel diameter
Correct Answer
C. ViscosityExplanation
When the hematocrit increases or plasma volume decreases, the concentration of red blood cells in the blood becomes higher. This leads to an increase in the viscosity of the blood. Viscosity refers to the thickness or stickiness of a fluid, and in this case, it represents the resistance to flow within the blood vessels. Therefore, as the viscosity increases, the resistance to blood flow also increases.Rate this question:
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- 42.
________________ equals cardiac output times peripheral resistance
- A.
Mean arterial pressure
- B.
Blood pressure
- C.
Pulse pressure
- D.
Arterial pressure
Correct Answer
A. Mean arterial pressureExplanation
Mean arterial pressure is the average pressure in the arteries during a cardiac cycle. It is calculated by multiplying the cardiac output (the volume of blood pumped by the heart per minute) by the peripheral resistance (the resistance to blood flow in the blood vessels). This equation reflects the relationship between the factors that contribute to mean arterial pressure.Rate this question:
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- 43.
If your BP is 100/70, what would be the mean arterial pressure?
- 44.
_________________ is the difference between the systolic and diastolic pressures.
- A.
Blood pressure
- B.
Arterial pressure
- C.
Pulse pressure
- D.
Blood colloid osmotic pressure
Correct Answer
C. Pulse pressureExplanation
Pulse pressure is the difference between the systolic and diastolic pressures. It is calculated by subtracting the diastolic pressure from the systolic pressure. Pulse pressure is an important indicator of cardiovascular health and can provide information about the elasticity and health of the arteries. A higher pulse pressure may indicate increased arterial stiffness, while a lower pulse pressure may suggest reduced cardiac output or other cardiovascular abnormalities. Therefore, pulse pressure is a crucial measurement in assessing blood pressure and overall cardiovascular function.Rate this question:
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- 45.
Where does capillary exchange occur?
- A.
In heart
- B.
In tunica media
- C.
Through or between endothelial cells
- D.
Through the ventricles
Correct Answer
C. Through or between endothelial cellsExplanation
Capillary exchange occurs through or between endothelial cells. Capillaries are tiny blood vessels that connect arteries and veins. They have thin walls made up of a single layer of endothelial cells. This thinness allows for the exchange of gases, nutrients, and waste products between the blood and surrounding tissues. Through diffusion, substances move through or between the endothelial cells to reach the tissues. This process is essential for delivering oxygen and nutrients to cells and removing metabolic waste products. The other options mentioned, such as the heart, tunica media, and ventricles, are not involved in capillary exchange.Rate this question:
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- 46.
What is the primary means of capillary exchange?
- A.
Diffusion
- B.
Osmosis
- C.
Filtration
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Capillary exchange refers to the movement of substances between the blood capillaries and the surrounding tissues. Diffusion is the primary means of capillary exchange, as it allows for the passive movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis, on the other hand, is the diffusion of water across a selectively permeable membrane, which also plays a role in capillary exchange. Additionally, filtration is another mechanism involved in capillary exchange, where pressure forces fluid and solutes out of the capillaries and into the surrounding tissues. Therefore, all of the above options (diffusion, osmosis, and filtration) are correct as they are the primary means of capillary exchange.Rate this question:
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- 47.
What will occur at the venous side of the capillaries because blood colloid osmotic pressure is greater?
- A.
Filtration
- B.
Reabsorption
- C.
Fluid exchange
- D.
No net fluid movement
Correct Answer
B. ReabsorptionExplanation
The blood colloid osmotic pressure is greater at the venous side of the capillaries, which means that there is a higher concentration of solutes in the blood compared to the surrounding tissues. This creates a pressure gradient that favors the movement of fluid from the interstitial space back into the capillaries. Therefore, the correct answer is reabsorption, as fluid will be reabsorbed into the capillaries at the venous side.Rate this question:
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- 48.
What monitors changes in blood pressure?
- A.
The sinoatrial node
- B.
Capillaries
- C.
Baroreceptors
- D.
Chemoreceptors
Correct Answer
C. BaroreceptorsExplanation
Baroreceptors are specialized sensory receptors that monitor changes in blood pressure. They are located in the walls of certain blood vessels, such as the carotid arteries and aorta. When blood pressure increases or decreases, these receptors detect the changes and send signals to the brain, which then triggers appropriate responses to regulate blood pressure. Baroreceptors play a crucial role in maintaining homeostasis and ensuring that blood pressure remains within a normal range.Rate this question:
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- 49.
What chemical is released by the kidneys as a result of low blood pressure?
- A.
Aldosterone
- B.
Epinepherine
- C.
Renin
- D.
Angiotensin
Correct Answer
C. ReninExplanation
Renin is released by the kidneys in response to low blood pressure. It is an enzyme that plays a crucial role in the renin-angiotensin-aldosterone system (RAAS). When blood pressure drops, renin is released into the bloodstream, where it acts on angiotensinogen to convert it into angiotensin I. This, in turn, gets converted into angiotensin II, a potent vasoconstrictor that helps to raise blood pressure. Angiotensin II also stimulates the release of aldosterone, which promotes sodium and water reabsorption by the kidneys, further increasing blood pressure. Therefore, renin is the correct answer in this context.Rate this question:
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- 50.
What does renin promote the production of?
- A.
Aldosterone
- B.
Angiotensin
- C.
Vasopressin
- D.
None of the above
Correct Answer
B. AngiotensinExplanation
Renin is an enzyme that is released by the kidneys in response to low blood pressure or low blood volume. It acts on a protein called angiotensinogen, which is produced by the liver, to form angiotensin I. Angiotensin I is then converted to angiotensin II by another enzyme called angiotensin-converting enzyme (ACE), which is found in the lungs. Angiotensin II is a powerful vasoconstrictor, which means it causes blood vessels to narrow, and this helps to increase blood pressure. It also stimulates the release of aldosterone from the adrenal glands, which helps to increase blood volume by promoting the reabsorption of sodium and water in the kidneys. Sources and related contentRate this question:
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Nov 04, 2024Quiz Edited by
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Feb 20, 2013Quiz Created by
Owenslm924
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