1.

a) Explain how blod circulation takes place in humans

Answer» <p>It consists of the heart and thebloodvessels running through the entire body. The arteries carrybloodaway from the heart; the veins carry it back to the heart. ... The pulmonarycirculationis where the fresh oxygen we breathe in enters theblood. At the same time, carbon dioxide is released from theblood</p>


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