Deoxygenated blood enters the alveoli., High CO2 concentration in blood that is returning from the body., High O2 concentration in inhaled air in the alveoli, Low CO2 concentration in inhaled air in the alveoli., Low oxygen concentration in blood that has returned from the body., 1 of many millions of alveoli in the lungs., Oxygenated blood leaves the alveoli., Inhaled air, Exhaled air.

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