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.
Correct Answer:
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