Why is the counter-current exchange system important for fish gills?

Question

Just wondering why it is important, very thankful for indepth anwsers, thankyou :)

Answer 1

Favourite answer

It increases the amount of oxygen that diffuses into the blood. With countercurrent exchange, the amount of diffusion is greater than 50%.

Answer 2

A! :) in the respiratory system of fish, as high O2 concentration water passes against the blood at a lower concentration the oxygen is passed from the water to the blood. therefore oxygen transfer, even if answer c is true..

Answer 3

important for a fast and easy exchange of gases