By the end of this section you should be able to:
 Explain the concept of digestion
 Identify parts of human digestive system and their adaptive features.
 Compare the human digestive system with that of the other mammals (ruminants)
 Explain the digestion process in humans
 Outline the end products of digestion.
What is digestion?
Most of food materials are either solid or semi-solid. Food material cannot be used by the body until it has been absorbed.