If "Lub-Dup" Describes a Heartbeat, the "Dup" Part of the Sound

question 20

Multiple Choice

If "lub-dup" describes a heartbeat, the "dup" part of the sound is caused by

• A) the apex of the heart hitting the anterior chest wall.
• B) a stenotic atrioventricular valve.
• C) the large force of the contracting ventricles.
• D) vibrations that result from the semilunar valves slamming shut.

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