What Does the Cardiac Cycle Reveal About the Opening and Closing

question 6

Multiple Choice

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.

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