Digestion in the Stomach
To understand the digestion mechanism in the stomach, it is important to know about the anatomy of the stomach. Look up Unit 6, in the Applied Physiology Course. You would notice that the stomach is a 'J' shaped organ and secretes gastric juice. The major components of gastric juice are hydrochloric acid and the enzyme pepsin, which is secreted in an inactive form called pepsinogen. Small amount of lipase is also produced but remains inactive because of the acidic nature of gastric juice. Rennin is present only in infants and helps in the digestion of milk protein 'casein'.