A-Level Biology OCR A
Exchange Water Adaptations Fish Gas System Gill Filaments
| Front |
Describe adaptations that make bony fish gas exchange system an efficient exchange surface. |
| Back |
Adaptations of fish exchange system:- Gill filaments & lamellae allow for very high surface area for diffusion
- Rich blood supply to lamellae maintain steep conc gradient
- Thin layers - short diffusion distances
- Tips of adjacent gill filaments overlap - resistance to flow of water increased and water movement decreased - more time to perform gas exchange
- Countercurrent exchange system - water & blood move in opposite directions to maintain steep conc gradient to extract as much oxygen as possible
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A-Level Biology OCR A