BRAINCAKEGas Exchange in Fish
All gas exchange systems must supply oxygen to respiring tissues and remove carbon dioxide produced by respiration rapidly enough.
In fish the distance between the environment and the individual cells of the tissues is relatively short.
Mass transport achieves efficient transport of gas over large distances, requires energy and does not occur across tissue barriers. Diffusion achieves gas transport across barriers.
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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.
- countercurrent exchange
- A system in which two fluids flow in opposite directions, maintaining a concentration gradient along the whole length of the exchange surface and maximising diffusion.
More in Exchange of Gases
- Diffusion Gradient
- Mass Transport
- Increasing the Rate of Diffusion
- Limitations of the Tracheal System
- Structure of the Gills
- Counter Current Exchange
- Gas Exchange in Leaves
- Stomata
All 28 lessons in Exchange of Gases · All AQA AS-level Biology topics