HUMAN NUTRITION

Detailed explanation-1: -Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication. Chemical digestion in the mouth is minor but consists of salivary amylase (ptyalin, or alpha-amylase) and lingual lipase, both contained in the saliva.

Detailed explanation-2: -The two mechanical digestion processes that occur in the small intestine are peristalsis and segmentation. Both these processes involve contractions of gastrointestinal muscles which also contribute to the physical breakdown of food.

Detailed explanation-3: -The small intestine (also called the gut) is the part of the digestive system where most chemical digestion takes place. Almost all the digestion and absorption of nutrients occurs here. Enzymes produced by the small intestine, liver and pancreas contribute to the chemical digestion of food.