(D) The $AV$ (atrioventricular) valves, which include the tricuspid valve and the mitral (bicuspid) valve, are anchored to the papillary muscles of th

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(D) The $AV$ (atrioventricular) valves, which include the tricuspid valve and the mitral (bicuspid) valve, are anchored to the papillary muscles of the ventricular walls by fibrous cords known as $Chordae \text{ } tendineae$.These structures prevent the valves from inverting into the atria during ventricular contraction (systole).