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 ________. multiple choice lubb (s1); ventricles contract dupp (s2); ventricles relax lubb (s1); ventricles relax lubb (s1); atria contract dupp (s2); atria relax

Explanation:

The second heart sound (S2), also known as "dupp", is produced when the aortic semilunar valve (and pulmonary semilunar valve) closes as the ventricles relax. The first heart sound (S1), "lubb", occurs when the atrioventricular valves close as the ventricles contract.

Answer:

B. dupp (S2); ventricles relax