why humans are said to have double circulatiom
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It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart. The left pump sends the newly oxygenated blood around the body.
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The meaning of double circulation is that the blood passes through the heart twice in one cycle. In humans, the deoxygenated blood is recived by the heart and sent to the lungs to be oxygenated. After being oxygenated the blood comes back to the heart to be distributed to all the parts of the body. Thus humans are said to have double circulation.
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