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In terms of being open or closed, what i...

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

A

Both are closed

B

Both are open

C

Mitral is closed, tricuspid is open

D

Mitral is open, tricuspid is closed

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