A movement of particles from an area of higher concentration to an area of lower concentration.
When cells respire they use up oxygen and glucose. so the concentration of this is low. However, they have a high concentration in the blood, so they diffuse from the capillaries into the cells.
However, when cells respire they produce a lot of carbon dioxide, so they have a high concentration of this in the cells. They have a low concentration in the blood because it diffuses from the cells into the blood.
The bigger the difference in concentration, the faster the rate of diffusion.
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