External respiration Internal respiration

External respiration	Internal respiration
i.              External respiration is also called breathing. ii.            It is a physical process. iii.           It takes place in the respiratory tract. iv.           The gaseous exchange between external atmosphere and the blood takes place during external respiration. v.             Oxidation of food does not occur during external respiration.	i.              Internal respiration is also called cellular respiration. ii.            It is a biochemical process. iii.           It takes place in the mitochondria inside the cell. iv.           The gaseous exchange between the blood and tissues occurs during inter respiration. v.             Oxidation of food occurs during internal respiration releasing energy.