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GCSE Biology Paper 1 (9-1 Exams)

Diffusion Increases Rate Capillaries Adapted Permeable Walls Substances

Capillaries are adapted for increased diffusion due to their permeable, one-cell-thick walls and narrowness, maximizing surface area.

Les capillaires sont adaptés pour une diffusion accrue grâce à leurs parois perméables d'une seule cellule d'épaisseur et à leur étroitesse, qui maximise la surface.

Front How are capillaries adapted to increase diffusion rate?
Back
  • They have permeable walls, so substances being exchanged with the cells can diffuse in and out
  • Their walls are one cell thick which increases the rate of diffusion by decreasing the distance over which it occurs
  • Very narrow, which gives them a large surface area compared to their volume, which increases the rate of diffusion.

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