Answer to Question #105361 in Human Anatomy and Physiology for Easwari

Question

Draw a labelled diagram of the teleost gill. How does counter current flow of blood and
water facilitate gas exchange in comparison to concurrent flow?

Answer 1

Countercurrent oxygen exchange (shown in the figure below) means the blood flows through the gills in the opposite direction as the water flowing over the gills. The maximum amount of oxygen that the blood could pick up would be only half of the total amount of oxygen in the water .