What Happens During Countercurrent Exchange in Fishes

question 14

Multiple Choice

What happens during countercurrent exchange in fishes?

• A) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion.
• B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface.
• C) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
• D) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport.
• E) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface.

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