Crossing Membranes Passive Processes

Crossing Membranes Passive Processes - Crossing Membranes 1...

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Crossing Membranes 1 – Passive Processes Book Reference: p.22-23
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Diffusion The After Shave Man
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Diffusion in Air
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Diffusion in water
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What is diffusion? (definition) Diffusion is the movement of molecules (or ions) from a region of high concentration to a region of lower concentration until they are spread out evenly
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Example 1 :Diffusion in the Alveoli: O 2 diffusing into the blood and CO 2 diffusing out of the blood
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Example 2: Some digested food diffuses across the gut wall into the blood
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What affects the rate of diffusion? Concentration gradient: The greater the difference in the concentration of a substance in two areas, the faster the rate of diffusion The rate of diffusion is directly proportional to the concentration gradient
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What affects the rate of diffusion?
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Small particles tend to diffuse faster than larger ones
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through thin membranes (e.g. exchange of gases through the
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Crossing Membranes Passive Processes - Crossing Membranes 1...

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