explain double circulation in human beings
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The human circulatory system has three key components: blood vessels, blood and the heart. It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart.
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The herat receives Deoxygenated blood from different parts of the body and it pumps blood to the lungs. the oxygenated blood from the lungs return 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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