Diffusion (lungs and muscle cell)
- 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
- Carbon dioxide
- 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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