Egestion This is the process through which the undigested and indigestible food substances are eliminated from the body.
Caecum and Appendix
While these have no roles in man, they play vital roles in the ruminant animals and other herbivores.
They contain some bacteria which secrete cellulose enzyme. These enzymes digest cellulose since most digestive systems cannot secrete cellulose digesting enzyme.
The bacteria and the herbivores are in a symbiotic relationship.