why is double circulation of blood necessary in human beings?
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in double circulation oxygenated and deoxygenated is separated from each other they do not mix it is necessary because they have high energy needs
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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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