HUMAN NUTRITION

Detailed explanation-1: -The majority of the digestive tract is composed of two muscular layers to allow for peristalsis-that is, the movement of food. The stomach, however, is composed of three layers, and is designed to account for mechanical digestion.

Detailed explanation-2: -Mechanical Digestion 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-3: -After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion. Mechanical digestion in the stomach occurs via peristaltic contractions of the smooth muscle from the fundus towards the contracted pylorus, termed propulsion.