Digestive System Diagram

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We eat food through our mouth. As the organic nutrients are complex and insoluble ,they are first broken down into simpler soluble substances with the help of digestive enzymes and this process is called digestion.

Digestion starts from the mouth .The food is processed with the help of teeth to generate particles which are small and of the same texture .Inside the mouth the salivary glands secrete saliva which contains an enzyme called salivary amylase that breaks down starch into sugar. From the mouth the food enters into the esophagus. By the peristaltic movement of the walls of the esophagus the food enters into the stomach.

The gastric glands on the wall of the stomach release HCl, a proteindigesting enzymescalled pepsin and mucus .The HCl creates an acidic medium for the action of the enzyme pepsin. The mucus protects the inner lining of the stomach from theacid.

The small intestine receives the secretion of the liver and pancreas. The food coming from the stomach is acidic and has to be made alkaline for the pancreatic enzyme to function. Bile juice helps in the emulsification of fats
The pancreas secretes pancreatic juice which contains trypsin for digesting proteins and lipase for breaking down of emulsified fats.The wall of the small intestine secretes succus entericus which helps in the complete digestion of starch,proteins and fat. Thevilli on the wall of the small intestine absorb the digested food and the remaining undigested food reaches the large intestine. Any digested food and water present in it is reabsorbed by their walls and the undigested food enters into the rectum and temporarily stored there and is pushed out through the anus.

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