Digestion of protein
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Digestion of protein starts in the stomach. The stomach releases gastrin in response to food, which stimulates digestive juices including hydrochloric acid and the enzyme pepsinogen. Pepsinogen is converted to the active enzyme pepsin in the stomach, which breaks proteins down into polypeptides. The pancreas then secretes trypsinogen, chymotrypsinogen and other enzymes into the small intestine to further break down polypeptides into dipeptides, tripeptides and amino acids with the help of the intestinal enzyme peptidase.
Digestion of protein
- 1. Digestion of Protein Starts in the Stomach Food entering the stomach stimulates the release of gastrin a hormone which stimulates the secretion of digestive juices from cells in the lining of the stomach wall.
- 2. Oesophagus Gastric juice Parietal Pepsinogen cells HCl Chief cells Hydrochloric Acid Pepsinogen Pepsin Pepsinogen Proteins Polypeptide Pyloric Sphincter Diagrammatic representation of a stomach.
- 3. • Peptic cells secrete pepsinogen Pepsinogen In the presence Pepsin of stomach acid is converted to Pepsin converts Protein in to Polypeptide
- 4. E Pancreas Pancreatic duct T T Ts Small C Intestine C Cs T Trypsinogen E Enterokinase Ts Trypsin P P C Chymotrypsinogen Cs Chymotrypsin Pp P Protein Pp Polypeptides Simpkins & Williams, 1987
- 5. • The enzyme peptidase is released from the small intestine wall. Peptidase Converts Protein in to Amino Acids
- 6. Absorption of Amino Acids in the Small Intestine S-cool. 2005. Glucose Blood Capillary Lacteal Amino Acid Dipeptide Tripeptide Fructose Bile Salts Active Transport Simple Diffusion Facilitated Transport
- 7. References • Simpkins & Williams, 1998 Advanced Human Biology. Italy: Collins Educational. • http://www.s-cool.co.uk/topic_quicklearn.asp?loc , 19.04.05.