describe double circulation of blood in human being why is it necessary
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Answer:
During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in 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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Answer:
it is necessary for pumping the blood into the entire body
Explanation:
single circulation cannot cause
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