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← Nature & AnimalsWhich factor limits oxygen extraction efficiency via countercurrent exchange in fish gills?
A)Viscosity increase within boundary layer
B)Channeling bypassing lamellar surfaces✓
C)Osmotic gradient disruption at interface
D)Temperature diffusion across thin membrane
💡 Explanation
When channeling occurs, fresh water bypasses the gill lamellae because of structural defects, reducing the efficient diffusion caused resulting in suboptimal countercurrent gas exchange. Therefore, by-passing prevents full advantage of the concentration gradients of oxygen, rather than viscosity increase, osmotic disruption, or thermal diffusion which influence different oxygen diffusion steps.
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