BIOM 3200 Lecture Notes - Lecture 1: Esophagus, Muscularis Mucosae, Gastric Mucosa

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 3200
• Professor: Clarence J Swanton

Document Summary

18. 1 introduction to the digestive system some digested molecules used for energy (caloric value), the rest used to make additional tissues. Digestion of polymers into monomers by means of hydrolysis reactions lumen of gi tract continuous with environment (open at both ends) Functions of digestive system: motility (ingestion, mastication, deglutition, peristalsis and segmentation, secretion (exocrine [hcl,hco3, enzymes] and endocrine [hormones] secretions, digestion (breakdown, adsorption (products to blood or lymph, storage and elimination, immune barrier. Digestive system is the gastrointestinal tract (or alimentary canal) and accessory organs. Gi tract is 9m (30ft) long, includes: oral cavity, pharynx, esophagus, stomach, small intestine, large intestine. Accessory organs: teeth, tongue, salivary glands, liver, gallbladder, pancreas. Simple columnar epithelium supported by lamina propria (thin connective tissue with lymph nodules) External to lamina propria is muscularis mucosae, thin muscle layer that makes small folds in certain parts of tract. Thick, vascular connective tissue layer where absorbed molecules enter blood/lymph.