Circulatory System and Heart - Applications
Q. What is the function of valves in the heart?
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A.
To increase blood pressure
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B.
To prevent backflow of blood
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C.
To regulate heart rate
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D.
To oxygenate blood
Solution
Valves in the heart prevent the backflow of blood, ensuring it flows in one direction.
Correct Answer: B — To prevent backflow of blood
Q. What is the primary role of capillaries in the circulatory system?
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A.
To transport blood
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B.
To exchange nutrients and waste
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C.
To store blood
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D.
To regulate blood flow
Solution
Capillaries are the sites of exchange where nutrients and waste products are exchanged between blood and tissues.
Correct Answer: B — To exchange nutrients and waste
Q. What is the role of the aorta in the circulatory system?
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A.
To carry deoxygenated blood to the lungs
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B.
To distribute oxygenated blood to the body
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C.
To collect blood from the body
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D.
To regulate blood pressure
Solution
The aorta is the main artery that distributes oxygenated blood from the heart to the rest of the body.
Correct Answer: B — To distribute oxygenated blood to the body
Q. Which chamber of the heart receives oxygenated blood from the lungs?
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A.
Right atrium
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B.
Left atrium
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C.
Right ventricle
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D.
Left ventricle
Solution
The left atrium receives oxygenated blood from the lungs via the pulmonary veins.
Correct Answer: B — Left atrium
Q. Which component of blood is primarily responsible for transporting oxygen?
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A.
Plasma
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B.
White blood cells
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C.
Platelets
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D.
Red blood cells
Solution
Red blood cells contain hemoglobin, which binds to oxygen and transports it throughout the body.
Correct Answer: D — Red blood cells
Q. Which part of the heart is responsible for pumping blood to the lungs?
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A.
Left atrium
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B.
Right atrium
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C.
Left ventricle
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D.
Right ventricle
Solution
The right ventricle pumps deoxygenated blood to the lungs for oxygenation.
Correct Answer: D — Right ventricle
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