In the countercurrent exchange in a fish's gills, the oxygen concentration is always _______ in the water than the blood along the entire pathway of each lamella.
A)higher
B)the same
C)lower

Question

Quizplus · Accepted Answer

In the countercurrent exchange system of a fish's gills, water flows over the gill lamellae in the opposite direction to blood flow. This arrangement maintains a gradient where the oxygen concentration in the water is always higher than in the blood, allowing efficient oxygen diffusion into the blood along the entire length of the lamella.

In the Countercurrent Exchange in a Fish's Gills, the Oxygen