explain the double circulation of blood in human beings. why is it necessary
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Ans. 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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Double circulation is the passage of blood twice through heart, once towards the lungs for getting oxygenated and once to get distributed to all parts of body, in order to complete one circulation.
it is necessary to ensure quickee supply of oxygen to various body parts
Hope it helps.
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