alleryDouble circulation in mammals means that blood passes through the heart
AOnly through the right side of the heart
BOnce only and then directly to the lungs
CThree times before returning to lungs
DTwice in one complete circuit of the body
Answer & Solution
Correct answer: D. Twice in one complete circuit of the body
1. The chapter section on double circulation describes the two circuits.
2. Pulmonary circuit: heart to lungs and back.
3. Systemic circuit: heart to body and back.
4. Blood passes through the heart twice in one full round.
_Source: Selina Concise Biology Class 10, Ch 7 The Circulatory System (Mistral OCR'd PDF), section on double circulation_
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