'P' in the heart have thicker muscular walls than 'Q' do. Also, 'R' ensure that blood does not flow backwards when the 'P' or 'Q' contract. Identify 'P','Q' and 'R'.

P: Ventricles, Q: Atria, R: Valves

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P: Atria, Q: Ventricles, R: Valves

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P: Ventricles, Q: Blood vessels, R: Atria

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P: Blood Vessels, Q: Atria, R: Valves

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Solution

The correct option is A P: Ventricles, Q: Atria, R: Valves
The right atrium of the heart links to the right ventricle by the tricuspid valve while the left atrium links to the left ventricle by the bicuspid valve. These valves prevent backflow of the blood into the atrium when the ventricle contracts. Ventricles have thicker muscular walls than atria. When each atrium contracts, it only needs to propel the blood a short distance into each ventricle while the ventricles need a more powerful contraction to propel blood to the systemic circulation. Therefore:
P $\to$ Ventricles, Q $\to$ Atria and R $\to$ Valves

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Similar questions

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

P in the heart have thicker muscular walls than Q do. Also, R ensure that blood does not flow backwards when the atria or ventricles contract.
P is ________

Q is ______

and R is_________

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

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion:

The valves of the heart (i.e., semilunar and atrio-ventricular valves) prevent any backward flow.

Reason:

The valves in the heart allows the flow of blood only in one direction, i.e. from the atria to the ventricles and from ventricles to the pulmonary artery or aorta.

Assertion(A): Walls of the ventricles are generally thicker than that of the atria.

Reason(R): Ventricles pump blood to different organs with high pressure.

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