Which Statement About Gill Circulation in Fishes Is True

question 18

Multiple Choice

Which statement about gill circulation in fishes is true?

• A) Efferent blood vessels bring low-oxygen blood to the gills.
• B) Blood flow during perfusion is bidirectional.
• C) O₂ diffuses from water into blood along the entire length of lamellae due to the high PO₂ gradient between water and blood.
• D) Afferent blood vessels carry high-oxygen blood to the gills.
• E) The direction of blood flow through the lamellae is the same as that of water flowing over the lamellae.

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