During the contraction of the heart, what prevents the backflow of blood?*
1 point
Thin walls of atria
Valves in the heart
Thick muscular walls of ventricles
Semilunar valves.
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4
Answer:
valves in the heart ......
Explanation:
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1
Answer:
I think the backflow of blood is prevented by Valves in the Heart
Explanation:
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