What prevents the atrioventricular valve cusps from turning inside out into the atria when the ventricles contract?
Correct answer A. Chordae tendineae attached to papillary muscles
Explanation
Chordae tendineae are tendinous cords linking the cusps to papillary muscles. During ventricular systole the papillary muscles contract, keeping the cords taut and preventing valve eversion.
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