For gas exchange to occur in the lung,the alveoli must have a higher oxygen content than the blood and a lower carbon dioxide content than the blood.

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Gas exchange in the lungs occurs through diffusion, where oxygen moves from the alveoli into the bloodstream and carbon dioxide moves from the bloodstream into the alveoli. This process occurs because the partial pressure of oxygen is higher in the alveoli than in the blood, and the partial pressure of carbon dioxide is higher in the blood than in the alveoli. As a result, oxygen moves down its concentration gradient into the blood and carbon dioxide moves down its concentration gradient out of the blood and into the alveoli.

For Gas Exchange to Occur in the Lung,the Alveoli Must