Question

In terms of being opened or closed, what is the state of the mitral and tricuspid valves (left and right atrioventricular valce, respectively) at the end of the first heart sound

Answer 1

Answer:

There is normal asynchrony in the closure of mitral (M1) and tricuspid (T1) valves, the mitral closure preceding tricuspid closure by 20 to 30 msec (0.02 to 0.03 sec.). This produces two audible components (M1-T1) referred to as normal or physiologic splitting of the first heart sound.

Explanation:

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Answer 2

During S1, the closing of the mitral valve slightly precedes the closing of the tricuspid valve, while in S2, the aortic valve closes just before the pulmonary valve.