Water across the gills of fish and the blood in ...

🏠 Medical Quiz
Circulation and Excretion

Water across the gills of fish and the blood in the gills does in opposite direction enhancing the diffusion of oxygen from the water into the blood. What is this flow in the opposite direction called?

A. undirectional flow

B. countercurrent exchange

C. atriventricular exchange

Select your answer:

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