During the Cardiac Cycle,what Makes the Aortic and Pulmonic Valves

question 61

Multiple Choice

During the cardiac cycle,what makes the aortic and pulmonic valves close after the ventricles contract?

• A) The papillary muscles relax,which allows the valves to close.
• B) Chordae tendineae contract,which pulls the valves closed.
• C) Reduced pressure in the ventricles creates a negative pressure,which pulls the valves closed.
• D) Blood fills the cusps of the valves and causes the edges to merge,closing the valves.

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