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Well, I'm not sure if we're talking about the same thing, but I recently learned that there are two kinds of blood (sort of) - blood with oxygen, and blood without oxygen. If the blood with oxygen and the blood that has yet to receive oxygen is mixed, then the person will always be tired. So there's a part in the heart that separates the blood that already received oxygen and the blood that is on it's way to receive oxygen. That part (I forgot what it was called) grows in shortly after birth. I hope we're talking about the same parts.

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14y ago

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