The "Lub" of the Lub-DUB Sounds Heard Through a Stethoscope

question 32

Multiple Choice

The "lub" of the lub-DUB sounds heard through a stethoscope when listening to the heart is produced by the

• A) inferior vena cava and superior vena cava emptying into the right atrium.
• B) closing of the two atrioventricular valves.
• C) contraction of the atria.
• D) closing of the aortic valve and pulmonary valve.
• E) pulmonary arteries emptying into the left atrium.

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