First slide

Circulatory Pathways

Question

The first heart sound (lub) is produced when

Moderate

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 SA node to the AV node.
D

the ejection of blood from the left ventricle into the aorta begins.

Solution

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves at the beginning of ventricular systole.
Closure of semilunar valves produces dupp sound.
The ventricular ejection begins after the lub sound.

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