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Per NCERT, what is DOUBLE CIRCULATION (in mammals + birds)?
ABlood pumps once only
BBlood passes through the HEART TWICE during one complete cycle of body circulation (once via pulmonary circuit, once via systemic)
CTwo separate blood streams in the same artery
DBlood circulates in two directions at once
Answer & Solution
Correct answer: B. Blood passes through the HEART TWICE during one complete cycle of body circulation (once via pulmonary circuit, once via systemic)
Per NCERT §5.4.1, double circulation = pulmonary loop (right side ↔ lungs) + systemic loop (left side ↔ body). Fish has single circulation.
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