The dicrotic notch recorded in the aorta immediately follows what mechanical event of the cardiac cycle?
A) Closure of the aortic valve
B) Closure of the atrioventricular valves
C) Isovolume contraction
D) Opening of the aortic valve

Question

Quizplus · Accepted Answer

Rather than immediately dropping off, aortic and pulmonary pressures rise again after the semilunar valves close. Note the feature termed the dicrotic notch, which is caused by the elastic recoil of the arteries. This recoil provides the extra "push" that helps maintain the head of pressure created by the ventricles.

The Dicrotic Notch Recorded in the Aorta Immediately Follows What