Question

Define double circulation in human beings . Why is it necessary?​

Answer 1

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 2

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Answer:

Double circulation in passage of head twice through heart once during systematic circulation and other during pulmonary circulation. It is necessary as it clearly separates oxygenated blood from deoxygenated blood

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