Diffusion (lungs and muscle cell)

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  • Created by: z_mills1
  • Created on: 05-06-14 09:33
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  • Diffusion
    • the movement of gas molecules from an are of high concentration to an area of low concentration
    • diffusion will only occur if there is a difference in pressure (diffusion gradient)
    • no pressure difference - no diffusion gradient - no diffusion
    • Diffusion in the lungs
      • Carbon dioxide
        • carbon dioxide diffuses from the blood into the air in the alveoli - crossing the semi-permeable membranes of capillary and alveoli walls
        • carbon dioxide diffuses more easily and rapidly through the semi-permeable membranes than oxygen
    • Diffusion at the muscle cell
      • as oxygenated blood flows slowly past the muscle cell, oxygen diffuses from the blood through the semi-permeable capillary and muscle cell walls
      • inside the cell - oxygen combines with myoglobin to form oxymyoglobin and is then transferred to a structure inside the cell (mitochondria)


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