The second heart sound (the 'dup' of 'lub-dup') is caused by:

a. opening of the atrioventricular valves.
b. closure of the atrioventricular valves.
c. opening of the semilunar valves.
d. closure of the semilunar valves.


Answer: d. closure of the semilunar valves.

Anatomy & Physiology

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