'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: Atria, Q: Ventricles, R: Valves

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

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

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P: Ventricles, Q: Atria, R: Valves

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Solution

The correct option is D 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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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 ________

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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

Give a reason for the following:
(a) The walls of the left ventricle are thicker than the walls of all other chambers.
(b) Blood flows away from the stomach and intestines is put into circulation via the liver and not directly.
(c) The blood groups of both the donor and recipient must be known before transfusing blood.
(d) Only the veins and not the arteries are provided with a valve.
(e) Atrial wall is less muscular than the ventricular wall.
(f) The arteries are deep-seated in the body.

Q. In the heart, which chambers have thicker walls-the auricles or the ventricles?

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