How your body turns food into the poo Human digestion system #stomach #digestivesystem #colon How does your body turn food into poop? Mechanical digestion begins in the mouth as the food is chewed. . Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates. The epiglottis is a flexible flap at the end of the larynx in the throat. It acts as a switch between the larynx and the esophagus to permit air to enter the airway to the lungs and food to pass into the esophagus. it is a muscular tube connecting the throat with the stomach. The esophagus is about 8 inches long. The esophagus muscle acts with peristaltic action to move swallowed food down to the stomach. The action of peristalsis looks like an ocean wave moving through the muscle The food then enters the stomach, which is a rounded, hollow j shape organ Located between the esophagus and the duodenum. the stomach has three mechanical tasks to do. First, the stomach must store the swallowed food and liquid. This requires the muscle of the upper part of the stomach to relax and accept large volumes of swallowed material., The inner layer of the stomach is full of wrinkles known as rugae. Rugae both allow the stomach to stretch in order to accommodate large meals and help to grip and move food during digestion. The second job is to mix up the food, liquid, with digestive juice produced by the stomach. The lower part of the stomach mixes these materials as a blender by its muscle action. and breaks down the food into tiny particles in 3 millimeters finally, the stomach empties this acidy mash slowly into the small intestine.