1.

ASSERTION: The muscular walls of ventricles is thicker than the auricles REASON : It prevents back flow of blood.

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Explanation:

1 ventricle are thick because it has to pump blood from heart to various distant ORGANS hence requires a get MUSCLE contraction. ... 2 the valves present between the auricles and ventricles prevents the BACK flow of blood when the ventricle is contracted



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