describe double circulation of blood in human beings why it is necessary
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Explanation:
There are two loops in which blood is circulated. ... This double circulatory system is important because it ensures provision of oxygenated blood to the muscle and not a mixture of oxygenated and de-oxygenated blood. Hence, this system ensures efficient supply of oxygenated blood to the muscles.
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Answer:
When blood passes through heart twice
Explanation:
this is known as double circulation
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