During the cardiac cycle, the S2 heart sound indicates the ________ of the ________ valves.
A) closing; mitral and tricuspid
B) opening; aortic and pulmonic
C) opening; mitral and tricuspid
D) closing; aortic and pulmonic

Question

Quizplus · Accepted Answer

The S2 heart sound occurs during diastole, specifically during the closure of the aortic and pulmonic valves, which prevent blood from flowing back into the ventricles. Therefore, choice D is the correct option. Choices A and C are incorrect because they describe the S1 heart sound, which occurs during systole and is caused by the closure of the mitral and tricuspid valves. Choice B is also incorrect because the S2 heart sound does not indicate the opening of any valves during the cardiac cycle.

During the Cardiac Cycle, the S2 Heart Sound Indicates the ________