Countercurrent exchange in the fish gill helps to maximize ________.
A) endocytosis
B) blood pressure
C) extraction of oxygen from the water
D) active transport
E) osmosis

Question

Quizplus · Accepted Answer

Countercurrent exchange in the fish gill allows for a higher concentration gradient of oxygen to be maintained between the water flowing over the gills and the blood in the gill filaments. This allows for more efficient extraction of oxygen from the water.

Countercurrent Exchange in the Fish Gill Helps to Maximize ________