SOLVED:Countercurrent gas exchange in the gills of a fish a. maintains a gradient that enhances diffusion. b. enables the fish to obtain oxygen without swimming. c. means that blood and water flow at different rates. d. allows O2 to diffuse against its partial pressure gradient.
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SOLVED:The countercurrent exchange mechanism in fish gills a. maximizes oxygen diffusion into the bloodstream. b. is a less efficient mechanism for gas exchange than that used in mammalian lungs. c. occurs because the flow of blood is in the same direction as water flowing across the gills. d. facilitates diffusion of CO2 into the blood of fishes. e. facilitates diffusion of oxygen into the environment.
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