The First Heart Sound (Lub) Results from the Closing of the _________

question 58

Multiple Choice

The first heart sound (lub) results from the closing of the _________ valves in the beginning of __________.

• A)AV; ventricular diastole
• B)semilunar; ventricular systole
• C)semilunar; ventricular diastole
• D)AV; ventricular systole

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