Why is blood circulation in human heart called double circulation?
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The human circulatory system is a double circulatory system. It has two separate circuits and blood passes through the heart twice: the pulmonary circuit is between the heart and lungs. the systemic circuit is between the heart and the other organs.
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Please use Your eyes behenaa...
BTW, Saranghae..
my question is "what is Mariana trench"?
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