Why is the circulation in man referred to as double circulation?
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Solution

In human heart, blood passes through the heart twice during one cardiac cycle.
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The deoxygenated blood comes to the heart and gets pumped to the lungs for oxygenation.
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Simultaneously, the oxygenated blood comes to the heart from lungs and goes to different organs.
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Due to this, blood circulation in the human heart is called double circulation.
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