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Physiology

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Cardiovascular System

Question
3 out of 6
 

Second heart sound occurs due to:(LQ)



A Opening of mitral and tricuspid valve

B Opening of aortic and pulmonary valve

C Closure of mitral and tricuspid valve

D Closure of aortic and pulmonary valve

Ans. D Closure of aortic and pulmonary valve

The first and second heart sounds are produced primarily by the closure of the atrioventricular (AV) and semilunar valves and the events that accompany these closures.

FIRST HEART SOUND

SECOND HEART SOUND

Low slightly prolonged ‘lub’

Produced by closure of mitral and tricuspid

valves at the start of ventricular systole Q

Short high pitched ‘dup’

Produced by closure of aortic and pulmonary valves Just after the end of ventricular systole Q