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What prevents the backflow of blood inside the heart during contraction?  (a) Valves in heart 

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What prevents the backflow of blood inside the heart during contraction? 

(a) Valves in heart 

(b) Thick muscular walls of ventricles 

(c) Thin walls of atria 

(d) All of the above

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The answer is (a) Valves in heart

Walls in the heart are responsible for only pumping of the blood and they are not responsible in blocking backflow of blood inside the heart during contraction.

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