Circulatory System and Heart - Competitive Exam Level
Q. What type of blood vessel is primarily responsible for nutrient and gas exchange?
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A.
Arteries
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B.
Veins
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C.
Capillaries
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D.
Arterioles
Solution
Capillaries are the smallest blood vessels and are primarily responsible for nutrient and gas exchange.
Correct Answer: C — Capillaries
Q. Which blood vessel carries oxygenated blood away from the heart?
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A.
Pulmonary artery
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B.
Aorta
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C.
Pulmonary vein
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D.
Superior vena cava
Solution
The aorta carries oxygenated blood away from the heart to the rest of the body.
Correct Answer: B — Aorta
Q. Which structure in the heart initiates the electrical impulse for contraction?
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A.
Atrioventricular node
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B.
Sinoatrial node
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C.
Bundle of His
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D.
Purkinje fibers
Solution
The sinoatrial (SA) node initiates the electrical impulse that triggers heart contractions.
Correct Answer: B — Sinoatrial node
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