ANSC 2120 Lecture Notes - Lecture 6: Mucin, Alpha-Amylase, Gross Anatomy

• School: Cornell University
• Department: Animal Science
• Course: ANSC 2120
• Professor: Debbie Cherney

Document Summary

Mechanisms vary widely with behavior and diet (see lec 5) incisor integrity is an important consideration in farm animals. Especially important in nonruminant herbivores which have only a single opportunity to thoroughly chew ingested feed (cid:2) Three main glands and their secretions: parotid (cid:2) (cid:2) (cid:2) Main constituents = water, enzymes, hco3, po4: submaxillary and sublingual. Reflex initiated by presence of food in the larynx. Propels food to the stomach by esophageal peristalsis. Reservoir for controlled release of digesta to the small intestine. Hydrolytic digestion by acid, enzymes (esp. protein) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) Pepsinogen (proenzyme) is secreted by chief cells and converted to the active enzyme (pepsin) by the combined actions of hcl and pepsin itself. Pepsin initiates breakdown (proteolysis) of dietary proteins to peptides: see flow diagram for visualization. Increases secretion of hcl, pepsinogen, and gastric motility. Stimulated by presence of feed in stomach.