Multiple Choice
When the doctor uses a stethoscope,she can listen to your beating heart.She hears "lub-dub,lub-dub." These sounds are created by _____.
A) muscles in the left ventricle
B) blood flowing through the aorta
C) blood pressure differentials from chamber to chamber
D) blood recoiling against the closed valves
Correct Answer:
Verified
Correct Answer:
Verified
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