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Nature & Animals

Which effect results when capillary blood flow disrupts osmotic exchange in fish gills?

A)Reduced ion absorption from water
B)Increased oxygen saturation of blood
C)Enhanced carbon dioxide expulsion
D)Decreased passive water influx

💡 Explanation

When blood flow is disrupted countercurrent flow is compromised, which impairs osmotic gradients needed for efficient ion absorption because the concentration difference across the gill lamellae decreases. Therefore the reduction in ion absorption occurs, rather than improving gas exchange fluxes or water influx which require functional gradient maintenance.

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