Which process optimizes oxygen extraction from water passing fish gills using countercurrent flow?

A)Maintaining diffusion gradient continuously✓

B)Increasing water viscosity near membranes

C)Minimizing water velocity across lamellae

D)Creating turbulent flow for mixing blood

💡 Explanation

When water flows across fish gills in a countercurrent fashion blood and water flow in the opposite directions, maintaining diffusion gradient because this ensures continuous oxygen transfer, thus maximizing O2 uptake. Therefore a constant diffusion gradient is optimal, ensuring efficacy, rather than manipulating fluid properties which reduce efficiency.

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Which process optimizes oxygen extraction from water passing fish gills using countercurrent flow?

💡 Explanation

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