Flow of Water Over Fish Gills Maintains a Concentration Gradient

question 17

Multiple Choice

Flow of water over fish gills maintains a concentration gradient (of gases) between the blood and the water over the length of the capillary bed; this is referred to as an/a __________ mechanism.

• A)osmotic
• B)passive
• C)countercurrent exchange
• D)active
• E)currency exchange

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