Counter current flow occurs through flow of water and blood in different directions within the respiratory system of a fish.This is mainly achieved by the blood taking in more oxygen with itself depending on the period of time the blood is exposed to water with high oxygen levels.This ensures that as the blood moves through the gills oxygen continues being obtained from water with the high oxygen concentration.This continues where the gills obtains more fresh water with more oxygen concentration and offloading the oxygen to gills thus maintaining a partial pressure oxygen within the gills.In this process the low oxygen blood combines with low oxygen water while, the high oxygen blood meets with the high oxygen water.
franco crick answered the question on March 9, 2018 at 12:48
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