Explain the digestion in the stomach.

Explanation

Food remains in the stomach for 4 to 5 hours, the rhythmic peristaltic movement churns and mixes the food with gastric juice and make it into a creamy liquid called chyme. The gastric secretion is partly controlled by autonomic reflexes. The secretion of gastric juice begins when the food is in the mouth. The gastric juice contains HCl and proenzymes. The proenzyme pepsinogen, on exposure to HCl gets converted into the active enzyme pepsin which converts proteins into proteoses and peptones (peptides). The HCl provides an acidic medium `(pH1.8)` which is optimum for pepsin, kills bacteria and other harmful organisms and avoids nutritiaction. The mucus and bicarbonates present in the gastric juice play an important role in lubrication and protection of the mucosal epithelium from the creding nature of mature of the highly acidic HCI (Figure). Another proteolytic enzyme found in gastric juice of infants tenin which helps in the digestion of milk protein, caseinogen to casein in the presence of calcim ions. This enzyme secretion gradually reduces with aging.