Gas-based circulatory system?

How would one go about designing such a system, in which liquid blood is replaced by some kind of gas? What kind of blood vessels would it need, how could blood cells and hormones travel through the system, what kind of pressure would it need, etc.?

To be clear, what I mean by a circulatory system is a closed system with a "heart" that pumps the gas and nutrients in it around the body like a liquid-based one.

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Gas-based circulatory system?

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