Exchange of Gases in Respiration | Zoology

In this article we will discuss about the need for the exchange of gases in respiration. 1. Transport of oxygen in the air or the oxy­gen dissolved in water to organs of respi­ration, gills or lungs. In cases, the body surface functioning as the respiratory or­gan, it is in direct contact with the oxygen in water or air. 2. Diffusion [...]