What prevents the backflow of blood inside the heart during contraction?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

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Solution

(b) valves

During contraction, valves prevent the back-flow of blood inside the heart.

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What prevents the backflow of blood inside the heart during contraction ?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

Question 18
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

Valves prevent backflow of blood inside the heart during contraction.

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

P in the heart have thicker muscular walls than Q does. Also, R ensures that blood does not flow back when the atria or ventricles contract.
Identify P, Q and R.

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What prevents the backflow of blood inside the heart during contraction? (a) thick muscular walls of ventricles (b) valves (c) thin walls of atria (d) all of the above

(b) valvesDuring contraction, valves prevent the back-flow of blood inside the heart.

What prevents the backflow of blood inside the heart during contraction?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

(b) valves

During contraction, valves prevent the back-flow of blood inside the heart.