Contraction of the papillary muscles would
a. eject blood from the ventricles
b. prevent the av valves from protruding into the atria
c. close the semilunar valves
d. cause the atria to eject their contents into the ventricles
e. open the semilunar valves

The correct answer will be option-B.

Explanation:

Papillary muscles are the muscle present in the ventricle of the heart to which chordae tendinae of the aortic valves gets attached.

The number of papillary muscles varies in both the ventricles as in the right ventricle, three papillary muscles are present whereas in the left ventricle two muscles.

They play an important role in the closing of the AV valves as ventricular contraction causes the chordae tendinae to contract which in turn contract the papillary muscles thereby closing the AV valve and prevent back-flow of the blood to the atria.

Thus, Option-B is the correct answer.

papillary muscles by chordae tendineae. During the relaxation phase of the cardiac cycle, the papillary muscles are also relaxed and the tension on the chordae tendineae is slight (see Figure 12b). However, as the myocardium of the ventricle contracts, so do the papillary muscles. This creates tension on the chordae tendineae (see Figure 13b), helping to hold the cusps of the atrioventricular valves in place and preventing them from being blown back into the atria.

answer:

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