Human Biology Questions Quiz! Exam
Put your knowledge of blood circulation to the test with our Human Biology Quiz focused on the human circulatory system! This quiz will challenge your understanding of how blood flows through the heart, arteries, veins, and capillaries to sustain life. Explore questions about heart anatomy, the function of different blood vessels, oxygen, and nutrient transport, and the vital processes that keep our bodies functioning.
Perfect for students, healthcare professionals, or anyone interested in biology, this quiz provides a comprehensive understanding of the human circulatory system. Learn fascinating facts and see how much you know about this life-sustaining process. Share with Read morefriends and see who’s the true biology expert!
Human Biology Questions and Answers
- 1.
This is liquid with all dissolved material.
- A.
Platelets
- B.
Erythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
C. PlasmaExplanation
Plasma is the correct answer because it is the liquid component of blood that contains all dissolved materials. It makes up about 55% of blood volume and carries various substances such as nutrients, hormones, waste products, and proteins. Plasma also plays a crucial role in transporting cells and maintaining proper blood pressure and pH balance. Therefore, plasma fits the description of being a liquid with all dissolved material.Rate this question:
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- 2.
These are small particles that are involved in clotting.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
A. PlateletsExplanation
Platelets are small particles that play a crucial role in the process of blood clotting. When there is an injury or damage to blood vessels, platelets are activated and form a plug at the site of injury to stop bleeding. They release chemicals that attract more platelets and help in the formation of a stable clot. Platelets also contain proteins that help in the coagulation process. Therefore, platelets are essential for maintaining hemostasis and preventing excessive bleeding.Rate this question:
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- 3.
These do not have a nucleus.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
B. EurythrocytesExplanation
Eurythrocytes, also known as red blood cells, do not have a nucleus. This lack of nucleus allows them to have more space to carry oxygen and carbon dioxide. The absence of a nucleus also means that eurythrocytes cannot replicate or repair themselves, which is why they have a limited lifespan of about 120 days. The primary function of eurythrocytes is to transport oxygen from the lungs to the body's tissues and remove carbon dioxide from the tissues back to the lungs for exhalation.Rate this question:
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- 4.
These are white blood cells.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
D. LeucocytesExplanation
Leucocytes are the correct answer because the statement "These are white blood cells" directly refers to leucocytes. Leucocytes, also known as white blood cells, are an important component of the immune system and play a crucial role in defending the body against infections and diseases. They are responsible for identifying and destroying foreign substances, such as bacteria and viruses, in the bloodstream. Therefore, leucocytes are the appropriate choice based on the given information.Rate this question:
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- 5.
These are cells of the immune system.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
D. LeucocytesExplanation
Leucocytes, also known as white blood cells, are cells of the immune system. They play a crucial role in defending the body against infections and foreign substances. Leucocytes are responsible for identifying and destroying pathogens, producing antibodies, and regulating the immune response. Unlike red blood cells (eurythrocytes) and platelets, which are involved in oxygen transport and blood clotting respectively, leucocytes are primarily involved in the immune response and maintaining overall immune system health.Rate this question:
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- 6.
These carry oxygen.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
B. EurythrocytesExplanation
Erythrocytes, also known as red blood cells, are responsible for carrying oxygen in the bloodstream. They contain a protein called hemoglobin, which binds to oxygen molecules and transports them to the body's tissues. Erythrocytes are biconcave in shape, allowing for a larger surface area for oxygen absorption. Their main function is to deliver oxygen to cells and remove carbon dioxide, aiding in the process of respiration.Rate this question:
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- 7.
These have hemoglobin.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
B. EurythrocytesExplanation
Erythrocytes, also known as red blood cells, contain hemoglobin. Hemoglobin is a protein that allows red blood cells to carry oxygen throughout the body. This is essential for the transportation of oxygen from the lungs to the tissues and organs. Therefore, erythrocytes are the correct answer because they have hemoglobin.Rate this question:
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- 8.
These are red blood cells.
- A.
Platelets
- B.
Eurythrocytes
- C.
Plasma
- D.
Leucocytes
Correct Answer
B. EurythrocytesExplanation
The correct answer is "Eurythrocytes" because the statement "These are red blood cells" directly refers to eurythrocytes. Eurythrocytes, also known as red blood cells, are responsible for carrying oxygen throughout the body. They have a unique shape and lack a nucleus, allowing them to efficiently transport oxygen.Rate this question:
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- 9.
________ are tubes for blood flow.
Correct Answer
VesselsExplanation
Vessels are tubes that transport blood throughout the body. They include arteries, veins, and capillaries, which all play a crucial role in circulating blood and allowing the exchange of oxygen, nutrients, and waste products between the tissues and organs. Without vessels, blood would not be able to reach all parts of the body efficiently, leading to serious health problems.Rate this question:
- 10.
Blood moves away from the heart.
- A.
Veins
- B.
Arteries
- C.
Both
Correct Answer
B. ArteriesExplanation
Arteries are the blood vessels that carry oxygenated blood away from the heart to the rest of the body. This is why the statement "Blood moves away from the heart" is correct and the answer is arteries. Veins, on the other hand, carry deoxygenated blood back to the heart. Both veins and arteries are important components of the circulatory system, but in this case, the focus is on the vessels that carry blood away from the heart.Rate this question:
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- 11.
This may or may not contain oxygenated or deoxygenated blood depending on where they are.
- A.
Veins
- B.
Arteries
- C.
Both
Correct Answer
C. BothExplanation
Veins and arteries can contain both oxygenated and deoxygenated blood depending on their location in the body. Veins usually carry deoxygenated blood back to the heart from the body's tissues, except for the pulmonary veins which carry oxygenated blood from the lungs to the heart. Arteries, on the other hand, typically carry oxygenated blood away from the heart to the body's tissues, except for the pulmonary artery which carries deoxygenated blood from the heart to the lungs. Therefore, both veins and arteries can contain either oxygenated or deoxygenated blood depending on their specific role and location in the circulatory system.Rate this question:
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- 12.
These are thick walled to withstand the high pressure of the ventricle contraction.
- A.
Veins
- B.
Arteries
- C.
Both
Correct Answer
B. ArteriesExplanation
Arteries have thick walls to withstand the high pressure of ventricle contractions. When the heart contracts, it pumps blood into the arteries, and the thick walls of the arteries help to maintain the pressure and prevent them from bursting. The muscular and elastic walls of arteries also allow them to expand and contract, helping to regulate blood flow and maintain proper circulation throughout the body. This is why arteries are the correct answer in this case.Rate this question:
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- 13.
Which of the following hormones is primarily responsible for regulating the sleep-wake cycle?
- A.
Insulin
- B.
Melatonin
- C.
Adrenaline
- D.
Growth hormone
Correct Answer
B. MelatoninExplanation
Melatonin, produced by the pineal gland in the brain, plays a crucial role in regulating the circadian rhythm, which includes the sleep-wake cycle. Its production increases in the evening, promoting feelings of drowsiness, and decreases in the morning, signaling wakefulness. While other hormones like insulin, adrenaline, and growth hormone have various functions in the body, they do not have the same primary regulatory effect on sleep patterns as melatonin. Sources and related contentRate this question:
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- 14.
These are thin walled with internal anti-backflow valves.
- A.
Veins
- B.
Arteries
- C.
Both
Correct Answer
A. VeinsExplanation
Veins are thin-walled blood vessels that carry deoxygenated blood back to the heart. They have internal anti-backflow valves that prevent the backward flow of blood. This helps to maintain the one-way flow of blood towards the heart. Arteries, on the other hand, carry oxygenated blood away from the heart and do not have these valves. Therefore, the given description of thin-walled vessels with internal anti-backflow valves matches the characteristics of veins.Rate this question:
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- 15.
This has a very low pressure.
- A.
Veins
- B.
Arteries
- C.
Both
Correct Answer
A. VeinsExplanation
Veins have a very low pressure compared to arteries. This is because veins carry deoxygenated blood back to the heart, and the pressure is reduced as the blood flows against gravity. Veins have thinner walls and less smooth muscle compared to arteries, which allows them to expand and accommodate larger volumes of blood. This low pressure in veins helps prevent damage to the delicate capillaries and allows for efficient return of blood to the heart.Rate this question:
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- 16.
Movement of blood is by skeletal muscle squeezing the vein, pushing blood towards the heart.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the movement of blood in the veins is facilitated by the contraction of skeletal muscles surrounding the veins. When these muscles contract, they squeeze the vein and push the blood towards the heart. This mechanism is known as the skeletal muscle pump and plays a crucial role in returning deoxygenated blood from the body back to the heart for oxygenation.Rate this question:
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- 17.
All exchange across capillary walls is by _________.
Correct Answer
diffusionExplanation
Exchange across capillary walls occurs through diffusion. Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the context of capillaries, oxygen, nutrients, and waste products diffuse across the capillary walls to reach the surrounding tissues. This process is driven by the concentration gradient between the blood in the capillaries and the interstitial fluid in the tissues. Therefore, diffusion is the mechanism responsible for the exchange of substances across capillary walls.Rate this question:
- 18.
What is not true about capillaries?
- A.
They can be found spreading through all tissues of the body.
- B.
All cells are far away from a capillary.
- C.
They are one cell layer thick.
- D.
All gasses and nutrients pass to either enter or leave the body's cells through this.
- E.
They usually connect an artery to a vein.
Correct Answer
B. All cells are far away from a capillary.Explanation
Capillaries are tiny blood vessels that can be found spreading through all tissues of the body. They are one cell layer thick and serve as the site of exchange for gases and nutrients between the blood and the body's cells. Unlike the statement suggests, capillaries are in close proximity to cells, allowing for efficient exchange of substances. They usually connect an artery to a vein, completing the circulatory system.Rate this question:
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- 19.
Blood with oxygen comes ____ ___ ______ to the left atrium, then to the left ventricle and then to the body through the aorta.
Correct Answer
from the lungsExplanation
Blood with oxygen is transported from the lungs to the left atrium, then to the left ventricle, and finally to the body through the aorta. This is the correct answer because it accurately describes the pathway of oxygenated blood in the circulatory system.Rate this question:
- 20.
Blood without oxygen comes _____ ___ _____ to the right atrium, then to the right ventricle and then to the lungs via the pulmonary artery.
Correct Answer
from the bodyExplanation
Blood without oxygen is deoxygenated blood, which is returned to the heart from the body through the veins. It enters the right atrium and then flows into the right ventricle. From there, it is pumped to the lungs through the pulmonary artery for oxygenation. So, the correct answer is "from the body."Rate this question:
- 21.
In a human heart, blood which has no oxygen is connected with blood which has oxygen.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
In a human heart, blood which has no oxygen (deoxygenated blood) is not connected with blood which has oxygen (oxygenated blood). The heart has separate chambers, with the right side receiving deoxygenated blood from the body and pumping it to the lungs to get oxygen. The left side of the heart receives oxygenated blood from the lungs and pumps it to the rest of the body. Therefore, the statement is false.Rate this question:
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- 22.
Human have a heart with 4 chambers. What are these chambers? Pick two.
- A.
2 atria
- B.
2 arteries
- C.
2 veins
- D.
2 ventricles
Correct Answer(s)
A. 2 atria
D. 2 ventriclesExplanation
The human heart is divided into four chambers: two atria and two ventricles. The atria are the upper chambers of the heart that receive blood from the veins and pump it into the ventricles. The ventricles are the lower chambers of the heart that receive blood from the atria and pump it out to the rest of the body. The arteries and veins mentioned in the options are not chambers of the heart, but rather blood vessels that carry blood to and from the heart.Rate this question:
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- 23.
_________ accept blood from veins.
- A.
Atria
- B.
Ventricles
Correct Answer
A. AtriaExplanation
The correct answer is Atria. The atria are the upper chambers of the heart and they receive blood from the veins. They act as collection chambers for blood returning to the heart from the body and lungs. The atria then contract to push the blood into the ventricles, which are the lower chambers of the heart responsible for pumping blood out to the rest of the body.Rate this question:
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- 24.
________ move blood from heart to arteries.
- A.
Atria
- B.
Ventricles
Correct Answer
B. VentriclesExplanation
The ventricles are responsible for pumping blood from the heart to the arteries. They are the lower chambers of the heart and have thicker walls compared to the atria. When the ventricles contract, they push the oxygenated or deoxygenated blood out of the heart and into the arteries, which then carry the blood to the rest of the body.Rate this question:
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- 25.
This is the pressure when the ventricles contract.
- A.
Systolic pressure
- B.
Diastolic pressure
Correct Answer
A. Systolic pressureExplanation
Systolic pressure refers to the pressure in the arteries when the heart is contracting and pumping blood into the circulation. It is the highest pressure recorded during a cardiac cycle. This pressure is typically measured as the first sound heard when taking a blood pressure reading using a sphygmomanometer. Diastolic pressure, on the other hand, is the pressure in the arteries when the heart is at rest between contractions.Rate this question:
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- 26.
This is the pressure when the ventricles are at rest.
- A.
Systolic pressure
- B.
Diastolic pressure
Correct Answer
B. Diastolic pressureExplanation
Diastolic pressure refers to the pressure exerted on the arteries when the heart's ventricles are at rest between contractions. During this phase, the heart is relaxed and filling with blood, allowing the blood to flow smoothly and steadily through the arteries. Diastolic pressure is an important indicator of cardiovascular health and is typically measured as the bottom number in a blood pressure reading. It represents the minimum pressure in the arteries and is essential for maintaining proper blood flow and organ function.Rate this question:
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- 27.
Blood pressure is usually measured in _________.
- A.
A vein
- B.
An artery
- C.
A ventricle
- D.
A node
Correct Answer
B. An arteryExplanation
Blood pressure is usually measured in an artery. This is because arteries carry oxygenated blood away from the heart to the rest of the body. Measuring blood pressure in an artery provides information about the force exerted by the blood against the arterial walls, which is an important indicator of cardiovascular health. Veins carry deoxygenated blood back to the heart, ventricles are the chambers of the heart, and a node is a small mass of tissue in the heart that helps regulate the heartbeat.Rate this question:
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- 28.
In a _______ heart, blood from the lungs (oxygenated) mixes with blood from the body (deoxygenated) in the single ventricle.- Each time the ventricle contracts it sends blood to the body and the lungs, both of which are mixed.
Correct Answer
frogExplanation
In a frog's heart, blood from the lungs (oxygenated) mixes with blood from the body (deoxygenated) in the single ventricle. Each time the ventricle contracts, it sends blood to both the body and the lungs, resulting in the mixing of oxygenated and deoxygenated blood.Rate this question:
- 29.
Which has a more efficient use of oxygen transport? Frogs or humans?
- A.
Frogs, because both the blood from the body and the blood from the lungs mix together in a single ventricle.
- B.
Humans, because unlike frogs we have a four chambered heart.
Correct Answer
B. Humans, because unlike frogs we have a four chambered heart.Explanation
Humans have a more efficient use of oxygen transport compared to frogs because they have a four-chambered heart. The four chambers of the human heart allow for a complete separation of oxygenated and deoxygenated blood, ensuring that oxygen-rich blood is efficiently pumped to the body and oxygen-poor blood is sent to the lungs for oxygenation. In contrast, frogs have a three-chambered heart where the blood from the body and lungs mix together in a single ventricle, leading to less efficient oxygen transport.Rate this question:
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- 30.
Pressure is very low in ______ because when blood moves through a capillary bed, it goes into a huge volume of tiny capillaries.- When blood enters this, it is at a very low pressure and the heart cannot maintain pressure in vessels so far away from the heart.
Correct Answer
veinsExplanation
The correct answer is veins. When blood moves through a capillary bed, it enters a network of tiny capillaries where the pressure is very low. The heart is unable to maintain high pressure in vessels that are far away from it. Veins are responsible for carrying blood back to the heart, and they have thinner walls and lower pressure compared to arteries. Therefore, it is logical to conclude that the pressure is very low in veins when blood moves through a capillary bed.Rate this question:
- 31.
In order to start a heartbeat, the heart does it on its own from ________.
- A.
A vein
- B.
An artery
- C.
A ventricle
- D.
A node
Correct Answer
D. A nodeExplanation
The correct answer is a node. The heart starts a heartbeat on its own from a node, specifically the sinoatrial (SA) node. The SA node is located in the right atrium of the heart and is often referred to as the natural pacemaker. It generates electrical impulses that initiate the contraction of the heart muscles, leading to a heartbeat. These electrical signals are then conducted through the atria and ventricles, causing them to contract and pump blood effectively.Rate this question:
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- 32.
What are the modified muscle groups called that initiate heartbeats?
Correct Answer
NodesExplanation
The modified muscle groups that initiate heartbeats are called nodes. Nodes are specialized cells in the heart that generate electrical signals, causing the heart muscles to contract and pump blood. The two main nodes involved in initiating heartbeats are the sinoatrial (SA) node, located in the right atrium, and the atrioventricular (AV) node, located between the atria and ventricles. These nodes play a crucial role in coordinating the rhythmic contractions of the heart and maintaining a regular heartbeat.Rate this question:
- 33.
The heart may be speeded up or slowed down by _______.
Correct Answer
nervesExplanation
The heart may be speeded up or slowed down by nerves. Nerves play a crucial role in regulating heart rate. The autonomic nervous system, specifically the sympathetic and parasympathetic divisions, controls the heart rate. The sympathetic nerves increase heart rate by releasing norepinephrine, while the parasympathetic nerves slow it down by releasing acetylcholine. These nerves transmit signals from the brain to the heart, allowing for precise control and adjustment of the heart rate based on the body's needs.Rate this question:
- 34.
This node is where the beat starts at.
- A.
Sinoatrial (SA)
- B.
Atrioventricular (AV)
Correct Answer
A. Sinoatrial (SA)Explanation
The correct answer is Sinoatrial (SA). The SA node is responsible for initiating the electrical impulses that regulate the heartbeat. It is located in the right atrium of the heart and acts as the natural pacemaker. The SA node generates electrical signals that cause the atria to contract and pump blood into the ventricles. From there, the electrical impulses travel to the AV node and then to the rest of the heart, coordinating the contraction and relaxation of the cardiac muscles to maintain a regular heartbeat.Rate this question:
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- 35.
This node is located just outside the right atrium.
- A.
Sinoatrial (SA)
- B.
Atrioventricular (AV)
Correct Answer
A. Sinoatrial (SA)Explanation
The correct answer is Sinoatrial (SA). The SA node is located just outside the right atrium. It is responsible for initiating the electrical signals that regulate the heart's rhythm and acts as the natural pacemaker of the heart. The SA node sends electrical impulses to the atria, causing them to contract and pump blood into the ventricles. From there, the electrical signals travel to the AV node, which then relays the signals to the ventricles, causing them to contract and pump blood out of the heart.Rate this question:
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- 36.
An impulse that is spread across the atria from the right atrium causing them to contract stimulates this node.
- A.
Sinoatrial (SA)
- B.
Atrioventricular (AV)
Correct Answer
B. Atrioventricular (AV)Explanation
The correct answer is Atrioventricular (AV). The explanation for this is that the impulse that is spread across the atria from the right atrium causing them to contract stimulates the Atrioventricular (AV) node. The AV node is responsible for transmitting the electrical signals from the atria to the ventricles, allowing for coordinated contraction of the heart chambers.Rate this question:
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- 37.
This node is located just above the right ventricle.
- A.
Sinoatrial (SA)
- B.
Atrioventricular (AV)
Correct Answer
B. Atrioventricular (AV)Explanation
The correct answer is Atrioventricular (AV). The explanation for this is that the node located just above the right ventricle is the atrioventricular (AV) node. The AV node is an important part of the electrical conduction system of the heart. It receives electrical impulses from the sinoatrial (SA) node and delays them before transmitting them to the ventricles. This delay allows for proper coordination between the atria and ventricles, ensuring efficient pumping of blood.Rate this question:
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- 38.
This node sends out an impulse causing the ventricles to contract.
- A.
Sinoatrial (SA)
- B.
Atrioventricular (AV)
Correct Answer
B. Atrioventricular (AV)Explanation
The correct answer is Atrioventricular (AV). The explanation for this is that the AV node is responsible for transmitting electrical signals from the atria to the ventricles in the heart. When the AV node receives an impulse, it causes the ventricles to contract, leading to the pumping of blood out of the heart. The SA node, on the other hand, is responsible for initiating the electrical signals that regulate the heart's rhythm.Rate this question:
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- 39.
The impulses caused by the nodes travel through modified muscle cells called _________ ______.- These make the impulse move quickly so that all the cells are stimulated to contract at the same time.
Correct Answer
Purkinje fibersExplanation
Purkinje fibers are modified muscle cells that help in the rapid transmission of impulses caused by the nodes. These fibers ensure that the impulse moves quickly, allowing all the cells to be stimulated simultaneously, resulting in the contraction of the cells.Rate this question:
- 40.
Red blood cells and erythrocytes are the same thing.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Red blood cells and erythrocytes are indeed the same thing. Erythrocytes are the scientific term for red blood cells, which are the most common type of blood cell and play a crucial role in transporting oxygen throughout the body. Therefore, it is correct to say that red blood cells and erythrocytes are interchangeable terms referring to the same component of blood.Rate this question:
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- 41.
The function of these is to carry oxygen from the lungs to the cells of the body.
Correct Answer
Red blood cellsExplanation
Red blood cells, also known as erythrocytes, are responsible for carrying oxygen from the lungs to the cells of the body. They contain a protein called hemoglobin, which binds to oxygen in the lungs and releases it to the tissues as they circulate through the bloodstream. This oxygen delivery is crucial for the proper functioning of all cells in the body, as oxygen is necessary for cellular respiration and energy production. Red blood cells also help remove carbon dioxide, a waste product, from the cells and transport it back to the lungs to be exhaled.Rate this question:
- 42.
The average life cycle of a red blood cell is how many days?
- A.
80
- B.
175
- C.
120
- D.
273
Correct Answer
C. 120Explanation
Red blood cells have an average life cycle of approximately 120 days. These cells are responsible for carrying oxygen throughout the body and removing carbon dioxide. Over time, they become worn out and are broken down in the spleen and liver. The body continuously produces new red blood cells to replace the old ones, maintaining a healthy balance. This average life cycle is important for understanding the body's ability to maintain a sufficient supply of red blood cells for proper functioning.Rate this question:
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- 43.
Red blood cells are red only because they contain a protein chemical called _________ which is bright red in color.
Correct Answer
hemoglobinExplanation
Red blood cells are red because they contain a protein chemical called hemoglobin, which is bright red in color. Hemoglobin is responsible for carrying oxygen from the lungs to the rest of the body. It binds with oxygen in the lungs, giving it a bright red color. When the oxygen is released to the tissues, the hemoglobin becomes darker in color. This is why oxygenated blood appears bright red, while deoxygenated blood appears darker red.Rate this question:
- 44.
Hemoglobin contains the element _______.- This makes it an excellent vehicle for transporting oxygen and carbon dioxide.
Correct Answer
IronExplanation
Hemoglobin contains iron, which allows it to bind to oxygen and carbon dioxide molecules. This ability to bind and release these gases makes hemoglobin an excellent vehicle for transporting oxygen from the lungs to the body's tissues, and carbon dioxide from the tissues back to the lungs for exhalation. Iron is essential for this process, as it forms a complex with oxygen and carbon dioxide, enabling their transport throughout the body via the bloodstream.Rate this question:
- 45.
As blood passes through the lungs, _______ _________ attach to the hemoglobin.
Correct Answer
oxygen moleculesExplanation
As blood passes through the lungs, oxygen molecules attach to the hemoglobin. This is because the main function of the lungs is to facilitate the exchange of gases, specifically oxygen and carbon dioxide. Oxygen molecules are inhaled and enter the bloodstream through the alveoli in the lungs. They then bind to the hemoglobin, a protein in red blood cells, forming oxyhemoglobin. This allows for the transportation of oxygen to the body's tissues, where it is essential for cellular respiration and energy production.Rate this question:
- 46.
As the blood passes through the body's tissue, the __________ releases the oxygen to the cells.
Correct Answer
hemoglobin, Hemoglobin, Haemoglobin, haemoglobinExplanation
Hemoglobin is the protein within red blood cells that binds to oxygen in the lungs and carries it throughout the body. When red blood cells reach the body's tissues, the hemoglobin releases the oxygen, allowing it to diffuse into the cells where it's used for cellular respiration and energy production.Rate this question:
- 47.
The empty hemoglobin molecules then bond with the tissue's _______ __________ or other waste gases, transporting it away.
Correct Answer
carbon dioxideExplanation
The empty hemoglobin molecules bond with the tissue's carbon dioxide or other waste gases, transporting it away.Rate this question:
- 48.
Which is NOT formed in the bone marrow?
- A.
Red blood cells
- B.
White blood cells
- C.
Platelets
- D.
Plasma
Correct Answer
D. PlasmaExplanation
Plasma is not formed in the bone marrow. Plasma is the liquid component of blood that carries various substances such as nutrients, hormones, and waste products. It is mainly composed of water, electrolytes, proteins, and other molecules. While red blood cells, white blood cells, and platelets are formed in the bone marrow, plasma is produced by the liver and released into the bloodstream.Rate this question:
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- 49.
These are defense cells.
Correct Answer
White blood cells, WBCs, WBCExplanation
White blood cells are a type of defense cells in the body. They play a crucial role in the immune system by protecting the body against infections and foreign substances. These cells are responsible for identifying and destroying pathogens, such as bacteria, viruses, and fungi. Additionally, white blood cells also help in the healing process and removing dead cells from the body. Therefore, the given answer is correct as it accurately identifies white blood cells as defense cells.Rate this question:
- 50.
Some of these are specifically used in the immune system response to disease, others are mainly scavengers to remove foreign particles from the blood.
Correct Answer
White blood cellsExplanation
White blood cells are a crucial component of the immune system and play a vital role in defending the body against diseases and infections. Some types of white blood cells, such as lymphocytes, are specifically involved in the immune response by recognizing and destroying pathogens. On the other hand, other types of white blood cells, like phagocytes, act as scavengers and help remove foreign particles, such as bacteria or dead cells, from the bloodstream. Together, these different types of white blood cells work collectively to maintain the body's overall health and protect it from harmful invaders.Rate this question:
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