BRAINCAKECounter Current Exchange
The gill lamellae have a rich blood supply.
The flow of water over the gill lamellae and the flow of blood through the gill lamellae are in opposite directions.
This ensures the maximum possible gas exchange.
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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
- Increasing the Rate of Diffusion
- Limitations of the Tracheal System
- Gas Exchange in Fish
- Structure of the Gills
- Gas Exchange in Leaves
- Stomata
- Limiting Water Loss in Insects
- Limiting Water Loss in Plants
All 28 lessons in Exchange of Gases · All AQA AS-level Biology topics