BRAINCAKETissue Fluid
The internal environment of multicellular organisms is called tissue fluid.
Cells exchange substances with tissue fluid.
Molecules needed are obtained from the surrounding tissue fluid and waste produces are released into tissue fluid to be taken away and excreted.
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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
- The Need for Specialised Exchange Surfaces
- Surface Area to Volume Ratio
- 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