what do you mean by double circulation
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The majority of mammals utilize a double circulatory system..This means we have two loops in which our blood circulates.one is oxygenated meaning oxygen rich and other is deoxygenated,w which means it has little to no oxygen,b it a lot of carbon dioxide.
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The same amount of blood passes through the heart twice. This type of circulation is called double circulation. It includes pulmonary circulation and systemic circulation.
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