Difference between excretion and egestion By: Ahsan Tariq Definition: These both words have the same work of eliminating waste but both take place in different places. Excretion is the process where the waste is removed from your cells of the body. Egestion is the process of removing undigested food from your body through anus. Here is a table showing you 5 differences between excretion and egestion: Excretion Egestion 1. The material which is excreted is sweat, urine and carbon dioxide. The material of egestion is faeces 2. The materials discharged are metabolic wastes such as carbon dioxide or oxygen The materials discharged are undigested food and other poisonous substances left from digestion. 3. Excretion takes place through nose, skin and urethra. Egestion takes place through anus and sometimes mouth. 4. The process of excretion takes place in both animals and plants. The process of egestion takes place in animals 5. The process of excretion happens in the cells of the body. The process of egestion happens through anus.