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(D) The inner surface of the ventricles is not smooth but contains irregular muscular ridges known as $trabeculae$ $carneae$. These ridges help in the

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trabeculae carneae

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(D) The inner surface of the ventricles is not smooth but contains irregular muscular ridges known as $trabeculae$ $carneae$. These ridges help in the contraction of the ventricles and prevent the suction effect of the blood against the ventricular walls. $Chordae$ $tendinae$ are the fibrous cords that attach the valves to the papillary muscles. $Papillary$ $muscles$ are conical projections from the ventricular walls that anchor the $chordae$ $tendinae$. $Interventricular$ $septum$ is the wall that separates the left and right ventricles.

Column-$I$	Column-$II$
$(a)$ Tricuspid valve	$(i)$ Between left atrium and left ventricle
$(b)$ Bicuspid valve	$(ii)$ Between right ventricle and pulmonary artery
$(c)$ Semilunar valve	$(iii)$ Between right atrium and right ventricle

Muscular ridges at the inner surface of the ventricles are called:

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