The "lub-dup" heart sounds are produced by:
A. the walls of the atria and ventricles slapping together during a contraction.
B. the blood hitting the walls of the ventricles and arteries, respectively.
C. the closing of the atrioventricular valves ("lub") and the closing of the semilunar valves ("dup").
D. the closing of the semilunar valves ("lub") and the closing of the atrioventricular valves ("dup").
Answer: C. the closing of the atrioventricular valves ("lub") and the closing of the semilunar valves ("dup").
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