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 movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
More in Exchange Surfaces and Breathing
- Gas Exchange in Unicellular Organisms
- Gas Exchange in Insects
- Diffusion Gradient
- Mass Transport
- Increasing the Rate of Diffusion
- Limitations of the Tracheal System
- Gas Exchange in Fish
- Structure of the Gills
All 24 lessons in Exchange Surfaces and Breathing · All OCR AS-level Biology topics