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What will mix in a single circulatory system? Why is this less efficient?

What will mix in a single circulatory system? Why is this less efficient?
Do you have a source material that you're meant to be learning this from? What does it mean for a circulatory system to be "single" or "double"?
Original post by anosmianAcrimony
Do you have a source material that you're meant to be learning this from? What does it mean for a circulatory system to be "single" or "double"?

The original question's from a ppq. It asks "Explain why having only one ventricle makes the circulatory system less efficient than having two ventricles"

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