describe the double circulation in human beings. Why is it necessary?
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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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1
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double circulation is a biological process in which oxygen reaches the heart and and the whole body in a time.
it is necessary to keep our heart pumping
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