Biology A-Level
Counter-current gas exchange in gills
What Counter-current gas exchange in gills means in Biology A-Level, as defined for OCR.
Definition of Counter-current gas exchange in gills
Check what you remember
Read the wording for your board, then hide it and explain Counter-current gas exchange in gills in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
A flow of water and blood across the lamellae in opposite directions that maintains a concentration gradient along the whole length, maximising oxygen diffusion.
Topics that use Counter-current gas exchange in gills
- Exchange surfaces (OCR A-Level)
Related terms
- Adaptations of exchange surfaces
- Airway structure and support
- Alveolar and capillary adaptations for diffusion
- Antagonistic muscle action
- Concentration gradients
- Correct use of the light microscope
- large surface area
- Maintaining concentration gradients
Using Counter-current gas exchange in gills in the exam
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