In the lungs, do oxygen and co2 move in opposite directions?

Carbon dioxide (CO2) is a waste product of cellular metabolism. You get rid of it when you breathe out (exhale). This gas is transported in the opposite direction to oxygen: It passes from the bloodstream – across the lining of the air sacs – into the lungs and out into the open.

Explanation:

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a woman is in the second stage of childbirth. which of these events may be occurring?

- delivery of baby out of the vagina