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The First Heart Sound ("Lubb") Is Produced as the Atrioventricular

Question 88

Multiple Choice

The first heart sound ("lubb") is produced as the atrioventricular valves ________ and the semilunar valves ________.

A) open; close
B) close; open
C) open; open
D) close; close
E) The actions of the valves do not contribute to the heart sounds.

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