What prevents backflow of blood inside the heart during contraction?
1. Thin walls of atria.
2. Valves in heart.
3. Thick muscular walls of ventricles.
Answers
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18
ANSWER
1. Valves ensure that blood does not flow backwards when the atria or ventricles contract.
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Answered by
5
Answer:
THICK MUSCULAR WALLS OF VENTRICLE
Explanation:
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