ANSC 101 Lecture Notes - Lecture 2: Trypsinogen, Ileum, Jejunum

• School: University of Maryland
• Department: Animal Science
• Course: ANSC 101
• Professor: Kasey Moyes

Document Summary

Foregut fermenters: cattle, sheep, deer: fermentation occurs near the beginning. Single-compartmentalized stomach: pigs, rodents, horses, chickens. Cecum size determines type of digester: carnivore, omnivores, herbivore. Hindgut fermenters: rodents, hamsters, and horses: fermentation occurs near the end. Cecum in humans, but function isn"t clear. Ruminants beef/dairy cattle, sheep, goats: regurgitate. Foregut fermenting pseudo ruminants: do not regurgitate, llama, kangaroo, camel. Hindgut fermenting non-ruminants: do not regurgitate, horse, rabbit, and hamster. Poultry chicken, turkey, other birds: non-ruminants. Saliva: lubrication, amylase (enzyme for starch digestion) Peristalsis: throughout digestive system, rhythmic contraction of smooth muscle. Pepsinogen: produced by chief cells, is a zymogen pre-functional enzyme, pepsinogen converted to pepsin when activated by hcl produced by parietal cells. Pepsin cleaves proteins to polypeptides of 8-10 amino acids in length. Mucin (mucus) protects stomach walls from self-digestion by pepsin and acidic environment. Hormones: secretin stimulates pancreas, cholecystokinin stimulates gall bladder. Bicarbonate (base) increases ph from 2 (stomach) to ph 6-8 (intestines)