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Diffusion is the net movement of particles from an area of high concentration to an area of low concentration across a concentration gradient.

Diffusion is animals tend to happen across a semi permiable membrane.

In the human body key areas for diffusion are:

  • across the avoli in the lungs (oxygen and carbon dioxide)
  • across the placents from mother to baby (oxygen and nutrients) and from baby to mother (carbon dioxide and other waste products)
  • across the small intestine into the blood stream (nutrients from digestion inc glucose)

The rate of diffusion is increased by adaptations such as:

  • thin surface membrane
  • large surface area
  • large difference in concentration gradient
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