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Why is circulation in humans called double circulation?

Answer and explanation

Correct answer: Blood passes through the heart twice in one complete cycle

Human circulation consists of two linked circuits. In pulmonary circulation, deoxygenated blood travels from the right side of the heart to the lungs and returns oxygenated. In systemic circulation, oxygenated blood leaves the left side for the body and returns to the heart. Thus blood passes through the heart twice in one complete cycle, making option A correct. The other options contradict the actual route and chamber functions.

Related tags

Double-CirculationHeartPulmonary-CirculationSystemic-CirculationLife ProcessesWorld Of LivingScienceClass 10 Mcq

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