ANATOMY

Detailed explanation-1: -Both physical and chemical digestion begin in the mouth or oral cavity, which is the point of entry of food into the digestive system. The food is broken into smaller particles by mastication, the chewing action of the teeth.

Detailed explanation-2: -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-3: -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-4: -The large pieces of food that are ingested have to be broken into smaller particles that can be acted upon by various enzymes. This is mechanical digestion, which begins in the mouth with chewing or mastication and continues with churning and mixing actions in the stomach.

Detailed explanation-5: -Your molars are the workhorses in your mouth. They mash, grind, crush and chew food with saliva and digestive enzymes until it is ready to swallow.