11. Describe double circulation in human beings. Why is it necessary?
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The deoxygenated blood is pumped by the right ventricle into the lungs for oxygenation. ... It is necessary for a human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
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It is a process which occurs in human heart as the oxygenated blood and deoxygenated blood pass through the heart at the same time and it also did not allow the mixing of blood and also conserves energy
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