How Much of O₂ from Water Flowing Over Gills Is

Question

How much of O2from water flowing over gills is extracted by countercurrent exchange?
A) 50% to 60%
B) 60% to 70%
C) 80% to 90%
D) 90% to 100%

Accepted Answer

Countercurrent exchange in fish gills is highly efficient, allowing them to extract approximately 80% to 90% of the oxygen from water flowing over their gills.

How much of O2 from water flowing over gills is extracted by countercurrent exchange?

How much of O₂ from water flowing over gills is extracted by countercurrent exchange?