BRAINCAKEThe Rate of Diffusion
The rate of diffusion is proportional to the surface area and the concentration gradient and is inversely proportional to the length of the diffusion path.
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Key terms in this lesson
- diffusion
- The net passive movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
- surface area to volume ratio
- The ratio of an organism's or structure's external surface area to its total volume, which decreases as size increases.
More in Exchange of Gases
- Tissue Fluid
- The Need for Specialised Exchange Surfaces
- Surface Area to Volume Ratio
- Features of A Specialised Exchange Surface
- Gas Exchange in Unicellular Organisms
- Gas Exchange in Insects
- Diffusion Gradient
- Mass Transport
All 28 lessons in Exchange of Gases · All AQA AS-level Biology topics