First slide

Circulatory Pathways

Question

The first heart sound (lub) is produced when

Easy

A

Semilunar valves close soon after joint diastole begins
B

Atrioventricular valves close soon after ventricular systole begins
C

An action potential propagates from the AV node to the SA node
D

The ejection of blood from the left ventricle into the aorta ends

Solution

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves at the beginning of ventricular systole.

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