Necessity of Double circulation of blood in humans ????
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The oxygenated blood from the lungs returns to the heart, which is pumped again into different parts of the body by the heart. Thus, the blood passes twice through the heart making one complete round through the body. This is called double circulation.
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Double circulation of blood in human beings prevents the mixing of oxygenated and deoxygenated blood. This allows a highly efficient supply of oxygen to the body and provides constant energy to organisms to maintain their body temperature.
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