BRAINCAKESurface Area to Volume Ratio
Exchange of substances with the environment takes place at the surface of an organism, but the materials absorbed are used throughout the whole volume or the organism.
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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.
More in Exchange of Gases
- Tissue Fluid
- The Need for Specialised Exchange Surfaces
- The Rate of Diffusion
- 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