HSCI 100 Lecture Notes - Lecture 11: Gastric Acid, Salivary Gland, Digestion

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Nienke Van Houten

Document Summary

Digestion- mechanically or chemically breaking down food into subunits. Movement- food must be moved along the gi tract in order to fulfill all functions. Absorption- movement of nutrients across the gi tract wall to be delivered to cells/tissues via the blood. Mucosa- innermost layer that produces mucus that protect the lining and also produce digestive enzymes. Submucosa- 2nd layer of loose connective tissue that contains blood vessels, lymphatic vessels and nerves. Muscularis- 3rd layer made of 2 layers of smooth muscle that move food along the gi tract. Serosa- outer lining that is part of the peritoneum that covers abdominal organs. 3 pairs of glands that secrets saliva. Enzyme (amylase) in saliva begins starch digestion. Mixes food with bile and with intestinal and pancreatic enzymes. Blind pouch at junction of small and large intestine. Stretching of wall stimulates the defecation reflex. Play role in processing and storing certain nutrients. Small sac, stores bile, release bile into small intestine.