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Human circulation is called double circulation because humans have a double circulatory system which comprises two separate circuits to pump blood through heart twice.

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Double circulation (double circulatory systems) are circulation systems in which blood flows through the heart twice. In the case of double circulation, pulmonary circulation - i.e. blood flow between the heart and lungs, is separate from systemic circulation - i.e. movement of blood from the heart through the rest of the body (excluding the lungs), then back to the heart.

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