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Question

'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'.

A
P: Ventricles, Q: Blood vessels, R: Atria
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B
P: Ventricles, Q: Atria, R: Valves
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C
P: Blood Vessels, Q: Atria, R: Valves
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D
P: Atria, Q: Ventricles, R: Valves
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Solution

The correct option is B 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 Ventricles, Q Atria and R Valves

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