Riet / STD-5 / Science-test
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RIET INTERNATIONAL SCHOOL / SCIENCE TEST
Questions and Answers
- 1.
The structure that separates the left and the right atrium Is
- A.
A) septum
- B.
interventricular septum
- C.
Interatrial septum
- D.
fossa ovalis
Correct Answer
C. Interatrial septumExplanation
The structure that separates the left and the right atrium is the interatrial septum. This wall-like structure divides the two atria of the heart, ensuring that oxygenated and deoxygenated blood do not mix. It acts as a barrier, allowing blood to flow from the right atrium to the right ventricle and from the left atrium to the left ventricle, without any crossover. The interatrial septum also contains a remnant of fetal circulation called the fossa ovalis, which is a small depression in the septum.Rate this question:
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- 2.
What is the main part of the circulatory system?
- A.
Lungs
- B.
Veins
- C.
Heart
- D.
Capillaries
Correct Answer
C. HeartExplanation
The main part of the circulatory system is the heart. The heart is responsible for pumping blood throughout the body, delivering oxygen and nutrients to the cells and removing waste products. It consists of four chambers - two atria and two ventricles - that work together to ensure efficient blood circulation. Without the heart, the circulatory system would not be able to function properly, making it the most crucial component of the system.Rate this question:
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- 3.
How many times per minute does the heart pump blood?
- A.
10 to 20
- B.
100 to 150
- C.
3 to 5
- D.
60 to 100
Correct Answer
D. 60 to 100Explanation
The correct answer is 60 to 100. The heart pumps blood at a rate of 60 to 100 times per minute. This range is considered normal for a healthy adult. It is important for the heart to pump blood at a sufficient rate to ensure that oxygen and nutrients are delivered to the body's tissues and organs.Rate this question:
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- 4.
All of the following are parts of the circulatory system except:
- A.
Heart
- B.
Lungs
- C.
Veins
- D.
Eyes
Correct Answer
D. EyesExplanation
The circulatory system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. It consists of the heart, blood vessels (including veins), and blood. The lungs are also a part of the circulatory system as they oxygenate the blood. However, the eyes are not directly involved in the circulatory system. While they do have blood vessels, they are part of the visual system and are not responsible for the transportation of blood and nutrients like the other components mentioned.Rate this question:
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- 5.
Smoking makes it hard to breathe.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Smoking causes damage to the lungs and airways, leading to inflammation and narrowing of the air passages. This makes it difficult for smokers to breathe properly. The harmful chemicals in tobacco smoke also reduce the amount of oxygen that can be absorbed into the bloodstream, further contributing to breathing difficulties. Therefore, it is true that smoking makes it hard to breathe.Rate this question:
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- 6.
What is the circulatory system responsible for? pick the best answer.
- A.
Transporting materials
- B.
Transporting materials through your whole body
- C.
Digesting food
- D.
Lets you breath
Correct Answer
B. Transporting materials through your whole bodyExplanation
The circulatory system is responsible for transporting materials through the entire body. It consists of the heart, blood vessels, and blood, which work together to deliver oxygen, nutrients, hormones, and other essential substances to all the cells in the body. Additionally, the circulatory system helps to remove waste products, such as carbon dioxide, from the cells and carries them to the organs responsible for elimination. Overall, the circulatory system plays a crucial role in maintaining the body's homeostasis and ensuring the proper functioning of all organs and tissues.Rate this question:
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- 7.
Plasma is about _____ percent water.
- A.
60
- B.
70
- C.
80
- D.
90
- E.
95
Correct Answer
D. 90Explanation
Plasma is the liquid component of blood, and it is composed mostly of water. Therefore, it can be inferred that plasma is approximately 90 percent water.Rate this question:
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- 8.
The left and right sides of your heart work ____.
- A.
Together
- B.
Separately
- C.
Against each other
- D.
None of the above
Correct Answer
A. TogetherExplanation
The left and right sides of the heart work together to pump blood throughout the body. The left side receives oxygenated blood from the lungs and pumps it to the rest of the body, while the right side receives deoxygenated blood from the body and pumps it to the lungs to be oxygenated. This coordinated effort ensures that oxygen-rich blood is delivered to the tissues and organs and oxygen-depleted blood is returned to the lungs for reoxygenation.Rate this question:
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- 9.
What is the smallest blood vessel?
- A.
Arteries
- B.
Capillaries
- C.
Veins
- D.
Option 4
Correct Answer
B. CapillariesExplanation
Capillaries are the smallest blood vessels in the human body. They are responsible for the exchange of oxygen, nutrients, and waste products between the blood and the surrounding tissues. Capillaries have thin walls, allowing for efficient diffusion of substances. Their small size and extensive network enable them to reach almost every cell in the body, ensuring proper oxygenation and nutrient supply.Rate this question:
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- 10.
The circulatory system is composed of:
- A.
The heart, blood, and blood vessels
- B.
The heart, the brain, and the lungs
- C.
The lungs, the blood, and the blood vessels
- D.
The brain, the heart, and the blood vessels
Correct Answer
A. The heart, blood, and blood vesselsExplanation
The circulatory system is responsible for transporting oxygen, nutrients, hormones, and other substances throughout the body. It consists of the heart, blood, and blood vessels. The heart acts as a pump, pumping blood through the blood vessels, which are a network of tubes that carry the blood to different parts of the body. The blood carries oxygen and nutrients to the cells and removes waste products. Therefore, the correct answer is the heart, blood, and blood vessels.Rate this question:
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- 11.
What links the arteries to the veins?
- A.
Muscle
- B.
Capillaries
- C.
Aorta
Correct Answer
B. CapillariesExplanation
Capillaries are the smallest blood vessels in the body that connect arteries to veins. They play a crucial role in the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Capillaries have thin walls that allow for the diffusion of substances, and their extensive network ensures that every cell in the body is supplied with oxygen and nutrients while waste products are efficiently removed. Therefore, capillaries are the link between the high-pressure arteries and low-pressure veins, enabling the circulation of blood throughout the body.Rate this question:
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- 12.
What happens when blood pools in the veins?
- A.
You fall over.
- B.
You become paralyzed
- C.
You get varicose veins
Correct Answer
C. You get varicose veinsExplanation
When blood pools in the veins, it causes the veins to become enlarged and twisted, leading to the development of varicose veins. This occurs when the valves in the veins, which help to keep blood flowing in the right direction, become weakened or damaged. As a result, blood flows backward and accumulates in the veins, causing them to bulge and appear swollen. Varicose veins are often seen in the legs and can cause symptoms such as pain, heaviness, and swelling.Rate this question:
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- 13.
Which of the following is NOT a function of white blood cells.
- A.
Guard against infection.
- B.
Fight parasites.
- C.
Attack bacteria.
- D.
Carry oxygen.
Correct Answer
D. Carry oxygen.Explanation
White blood cells, also known as leukocytes, play a crucial role in the immune system and are responsible for protecting the body against infections. They fight parasites and attack bacteria to prevent the spread of harmful pathogens. However, carrying oxygen is not a function of white blood cells. This task is primarily carried out by red blood cells, which contain hemoglobin and transport oxygen to various tissues and organs in the body.Rate this question:
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- 14.
When in the lungs, the __________ leaves the blood.
- A.
Oxygen
- B.
Carbon Dioxide
- C.
Nitrogen
- D.
Phosphorus
Correct Answer
B. Carbon DioxideExplanation
When in the lungs, carbon dioxide leaves the blood. During the process of respiration, oxygen is taken in by the lungs and transferred into the bloodstream, while carbon dioxide, which is a waste product of cellular respiration, is removed from the bloodstream and exhaled out of the body. This exchange of gases occurs in the alveoli, tiny air sacs in the lungs, where oxygen diffuses into the blood and carbon dioxide diffuses out of the blood into the lungs to be expelled.Rate this question:
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- 15.
Blood, blood vessels, and the heart make up the ________ system.
- A.
Circulatory
- B.
Respiratory
- C.
Digestive
- D.
Reproductive
Correct Answer
A. CirculatoryExplanation
The correct answer is circulatory because blood, blood vessels, and the heart are all components of the circulatory system. The circulatory system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. It consists of the heart, which pumps blood, and the blood vessels, which carry the blood to different parts of the body.Rate this question:
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- 16.
Which chamber is #1? (hint: it is large)
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
A. Right atriumExplanation
The correct answer is the right atrium. The hint provided in the question states that the chamber is large, and the right atrium is indeed one of the larger chambers of the heart.Rate this question:
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- 17.
Which chamber is #2 ?
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
B. Left atriumExplanation
The left atrium is chamber #2 because it is the second chamber that blood flows into from the lungs. After oxygenated blood returns to the heart from the lungs, it enters the left atrium before being pumped into the left ventricle and then out to the rest of the body.Rate this question:
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- 18.
Which chamber is #3 ?
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
D. Left ventricleExplanation
The left ventricle is chamber #3 because it is the third chamber in the sequence of chambers in the heart. The heart has four chambers: two atria (left and right) and two ventricles (left and right). The left ventricle is responsible for pumping oxygenated blood to the rest of the body and is located on the left side of the heart.Rate this question:
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- 19.
Which chamber is #4 ? (hint: It is large)
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
C. Right ventricleExplanation
The correct answer is right ventricle because it is described as being large. The right ventricle is one of the four chambers of the heart and is responsible for pumping oxygen-poor blood to the lungs. It is larger than the right atrium, left atrium, and left ventricle, making it the most likely choice based on the given hint.Rate this question:
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- 20.
The hormones found in the human body are located in
- A.
The circulatory system
- B.
The spinal cord
- C.
The veins and capillaries
- D.
The Endocrine System
Correct Answer
D. The Endocrine SystemExplanation
The correct answer is the Endocrine System. Hormones in the human body are produced and secreted by various glands in the endocrine system, such as the pituitary gland, thyroid gland, adrenal glands, and others. These hormones are then released into the bloodstream and transported to target cells or organs, where they regulate various physiological processes and maintain homeostasis in the body. The circulatory system, spinal cord, veins, and capillaries do not produce or store hormones in the same way as the endocrine system does.Rate this question:
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