The First Heart Sound

question 49

Multiple Choice

The first heart sound

• A)occurs when the AV valves open
• B)occurs when the semilunar valves close
• C)signals the onset of ventricular diastole
• D)occurs when the AV valves close, and signals the onset of ventricular systole
• E)occurs when the semilunar valves close, and signals the onset of ventricular diastole

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