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.
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What is the correct answer to this question?
Blood passes through the heart twice in one complete cycle
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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