PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Absent tunica intima
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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: -The second heart sound (S2) occurs with closure of the semilunar valves. Normally opening of the semilunar valves is silent, but in aortic or pulmonic stenosis, and ejection clock may be heard.An ejection click occurs early in systole at the start of ejection because it results from opening of the semilunar valves.