40. Circulatory System
Gas Exchange
Multiple Choice
Multiple ChoiceCountercurrent flow in the gills of a fish __________.
A
speeds up the flow of water through the gills
B
enables blood oxygenation in fish regardless of the direction of water flow relative to blood flow
C
means that blood and water flow in the same direction
D
interferes with the efficient absorption of oxygen
E
maintains a gradient that enhances diffusion
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