What does the cardiac cycle reveal about the opening and closing of the heart valves?
A) There are times when all four heart valves are open.
B) There are no times when all four heart valves are closed.
C) The AV valves close first, then the semilunars open and close, then the AV valves open.
D) The AV valves open, then the semilunars open, then the AV valves close, followed by closure of the semilunars.
Correct Answer:
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