Question

lu) Illas / 110II2UIllal TUWS RIIUWIt av urvurur
7. What prevents 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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Answer 1

Explanation:

VALVES IN HEART (A) PREVENT BACKFLOW OF BLOOD

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Answer 2

Answer:

(d) is the correct answer because these three plays a major role in the transport function of the heart..

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