SCIENCE
CIRCULATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What physical feature of large systemic arteries (resistance vessels) makes them relatively more responsive to changes in intracellular calcium concentrations?
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Absent tunica intima
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Thick tunica media
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Absent tunica media
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Thick tunica intima
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Explanation:
Detailed explanation-1: -A thick tunica media is characteristic of large systemic arteries. A thick tunica media explains the responsiveness of large systemic arteries to changes in intracellular calcium concentrations.
Detailed explanation-2: -Tricuspid and mitral valves are atrioventricular valves. These valves are actively closed by the papillary muscles (when the ventricles contract) to prevent backflow into the artia.
Detailed explanation-3: -Semilunar valves are not associated with the papillary muscles, and are not actively closed.
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