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Diffusion from high concentration to low concentration.

  1. The oxygen concentration in the air in the lungs is higher than in the blood.
  2. The oxygen concentration in the blood is higher than in body cells.
If these differences in concentration did not exist oxygen could not move from the air to the blood to body cells. While we are alive body cells consume some of the oxygen they receive, reducing their oxygen concentration and maintaining these differences.

When we die the body cells quit consuming oxygen and over a period of time the levels of oxygen slowly begin evening out (however as blood no longer moves from the lungs to the body oxygen diffusion slows dramatically, leaving some body cells with much lower oxygen levels than would be normal).

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