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प्रश्न
What prevents the backflow of blood inside the heart during contraction?
विकल्प
Valves in the heart
Thick muscular walls of ventricles
Thin walls of atria
All of the above
उत्तर
Valves in the heart
Explanation -
The walls of the heart are only responsible for pumping blood; they are not responsible for preventing blood from flowing backwards into the heart during contraction.
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