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The "lubb" sound (first heart sound) is ...

The "lubb" sound (first heart sound) is caused by

A

Closure of Smiunar value

B

Closure of Pulmonary & Aortic Valve

C

Vibration just after Closure of Mitral & Tricuspid valuve

D

Vibration after Closure of Pulmonary & Aortic Valve

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Read the following statement and choose the correct option. A. The first heart sound (lub) is associated with the closure of both semilunar valves. The duration between the adjacent second heart sound and first heart sound is 0.3 seconds C. The cardiac output is the stroke volume multiplied by the number of heartbeats per minute.

A : Dub is a long and sharp sound. R : It is caused by closing of atrio ventricular valves.