What is meant by "double circulation" in humans?
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Blood flows through the heart once for every full circuit.
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Blood flows through the heart twice for every full circuit (pulmonary and systemic).
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Both oxygenated and deoxygenated blood mix in the heart.
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The heart has two chambers.
📝 Detailed explanation
Humans have two separate circuits: one to the lungs (pulmonary) and one to the rest of the body (systemic).
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