What Causes the Cardiac Valves to Open and Close

question 3

Multiple Choice

What causes the cardiac valves to open and close?

• A) Chordae tendineae contract and relax to open and close the valves.
• B) Papillary muscles contract and relax to open and close the valves.
• C) As the walls of the heart's chambers stretch or relax, they send nervous impulses to the valves, stimulating them to open or close.
• D) Pressure changes in the cardiac chambers cause the valves to open and close.

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