This is diffusion
- Oxygen moves from the water into the blood and carbon dioxide from the blood into the water by diffusion
Countercurrent gas exchange - concentration current is high = good rate of diffusion
The blood flow in the capilaries is the opposite to the flow of water over the gills = this means the blood is meating the new water with a full load of oxygen countercurrent exchange of water flow and blood stream maintains concentration gradients for diffusion.
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