Countercurrent Exchange in the Fish Gill Helps to Maximize

Question

Countercurrent exchange in the fish gill helps to maximize
A)endocytosis.
B)blood pressure.
C)diffusion.
D)active transport.
E)osmosis.

Accepted Answer

Countercurrent exchange in fish gills helps to maximize diffusion by maintaining a concentration gradient between the oxygen-rich water and the oxygen-poor blood flowing through the gills in opposite directions. This allows for efficient uptake of oxygen from the water into the blood.