Digestion is a complex process that begins in the mouth. It involves the alimentary canal which starts from the mouth and extends to the anus. Various glands are present in the body that secrete digestive enzymes which help in breaking down food. Food provides energy for the body to function and for the cellular processes to work effectively. Thus, digestion helps in the utilization of food so that it can provide energy. Mechanical digestion begins in the mouth where the food gets converted into small substances with the help of teeth. The tongue mixes the food with the saliva and also provides lubrication which pushes the food forward into the esophagus. Peristalsis is the main mechanism through which food moves forward.
Digestion in Stomach and Intestine
When the food reaches the stomach, it is mixed with gastric juice which contains hydrochloric acid, some inorganic salts, water, and enzymes. Because of the mixing of food with gastric juice, the food gets converted into chyme which is a thick and creamy substance. There are muscles in the stomach wall that also help in the mixing of food with the digestive enzymes. Duodenum is the part present in the small intestine. The food is pushed down into the duodenum and the greatest part of the digestion takes place in this region. Numerous enzymes are produced in the small intestine, contributing to the breakdown of carbohydrates, fats, and proteins. The muscles of the small intestine also produce different types of movements. Such motions help to combine food thoroughly with different digestive enzymes and thereby promote digestion.
Other Organs in the Digestive System
The liver releases bile juice and the pancreas secrete pancreatic juice into the small intestine. Bile juice helps in breaking down fats into smaller substances (fatty acids). On the other hand, pancreatic juice contains various enzymes like amylase, lipase, and protease which help in the digestion of carbohydrates, fats, and proteins respectively. The other two regions of the small intestine are jejunum and ileum. They are mainly involved in the absorption of nutrients from processed food. Food moves into the large intestine after the small intestine, where absorption of remaining nutrients and water takes place. In the rectum, the resulting fecal matter is collected, from where it passes out of the body through the egestion process.
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