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Which of the following pairs is mismatched?
A. endocardium - covers the inner surface of the heart
B. myocardium - cardiac muscle
C. trabeculae carneae - interior walls of ventricles
D. pectinate muscles - muscles that close valves
E. chordae tendineae -connective tissue strings that connect to cusps of valves

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Answer:

The correct answer is D.

Explanation:

Papillary muscles, attached via chordae tendineae, help to close the valves and prevent regurgitation.

Pectinate muscles are parallel ridges in the walls of the atrium of the heart, mainly in right atrium. They can stretch during adverse loading conditions, to help the right atrium to dilate without much wall stress.

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