Question

When the aortic semilunar valve closes and blood bounces off of it, it produces the __________ heart sound that is ultimately related to when the __________.

A. lubb (S1); atria contract
B. dupp (S2); atria relax
C. lubb (S1); ventricles contract
D. dupp (S2); ventricles relax
E. lubb (S1); ventricles relax

Answer 1

The heart sound produced when the aortic semilunar valve closes and blood bounces off of it is the dupp (S2) sound. This sound is related to when the ventricles relax.

Step-by-step explanation:

The heart sound produced when the aortic semilunar valve closes and blood bounces off of it is the dupp (S2) sound. This sound is related to when the ventricles relax. When the ventricles relax, blood attempts to flow back into the ventricles from the aorta, causing the aortic semilunar valve to close and create the second heart sound, or S2. This sound is commonly described as a 'dub.'