The Countercurrent Exchange System Found in Fish Gills Maximizes Gas

The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:

A) producing rapid water flows across the gill surface.
B) allowing water and blood to come in direct contact to maximize oxygen exchange.
C) having a high concentration gradient of oxygen at the start of the capillaries.
D) maintaining a high concentration gradient of oxygen along the entire length of capillaries.
E) decreasing the oxygen content of the blood leaving the gill filaments.

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