What prevents backflow of blood inside the heart during contraction?

Valves in heart

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Thick muscular walls of ventricles

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Thin walls of atria

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All of the above

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Solution

The correct option is A Valves in heart

Valves ensure that blood does not flow back when the atria or ventricles contract. Since ventricles have to pump blood into various organs with high pressure, they have thicker walls than atria. The separation of the right side and left side of the heart by value also helps to keep oxygenated and deoxygenated blood from mixing so as to supply a high amount of oxygen to the body.

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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

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

Valves prevent 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.

Q. Choose the correct statements :
I. The heart is a hollow organ present in the thoracic cavity
II. The pulmonary veins are guarded by valves which prevent the backflow of blood.
III. The walls of the left ventricle are about three times thicker than the right ventricle.
IV. Pulmonary arteries carry deoxygenated blood to the lungs
V. The foetal heart has an opening between two atria

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