Papillary muscles are found in

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(D) Papillary muscles are specialized muscles located in the ventricles of the mammalian heart. They attach to the cusps of the atrioventricular valve

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Heart of mammal

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(D) Papillary muscles are specialized muscles located in the ventricles of the mammalian heart. They attach to the cusps of the atrioventricular valves (mitral and tricuspid valves) via the chordae tendineae. Their primary function is to prevent the inversion or prolapse of these valves into the atria during ventricular systole,thereby ensuring unidirectional blood flow. Therefore,the correct option is $(d)$.

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