A
COâ‚‚ is the waste product of respiration of cells. Oxygen, on the other hand, is required in cellular respiration. Therefore at the alveolar in the lungs of an organism, COâ‚‚ will be expelled while Oâ‚‚ will be taken in.
Explanation:
This occurs passively due to the diffusion gradient, COâ‚‚ usually has a higher concentration in the blood and lower concentration in alveoli hence this gas diffuses from the bloodstream into the lungs. On the other hand, oxygen is higher in concentration in the alveoli than in the blood capillaries hence difuses into the blood and taken to the cell for respiration. The COâ‚‚ in the lungs is then expelled through exhalation of the lungs.
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