How oxygen diffuse into the blood

Biology

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Answer

Oxygen diffuses into the blood through a process called passive diffusion, driven by differences in partial pressure.

Step-by-step solution

3 steps

  1. In the lungs, the partial pressure of oxygen (PO₂) in the alveoli is higher than in the deoxygenated blood arriving from the body.

  2. This pressure gradient causes oxygen molecules to move from the alveoli, across the thin alveolar and capillary walls, into the blood plasma.

  3. Most oxygen then binds to hemoglobin within red blood cells, which facilitates the transport of large amounts of oxygen throughout the body.

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