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Elucidate the process of double circulat...

Elucidate the process of double circulatory system with the help of a diagram.
Write one function each of the following components of the transport system in human beings: a) Blood vessels b) Blood platelets c) Lymph d) Heart

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The oxygenated blood from the lungs returns to the heart, which is pumped again into different parts of the body by the heart. Thus, the blood passes twice through the heart making one complete round through the body. This is called double circulation.
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