HSCI10171 Lecture Notes - Lecture 11: Gastrointestinal Tract, Digestion, Esophagus
Document Summary
Function of the digestive system: ingestion, digestion, absorption, elimination. Digestion: the breakdown of food into smaller molecules suitable for absorption, takes place within the digestive tract, mechanical & chemical. Mechanical digestion by physical means: achieved by chewing, churning and mixing movements of the stomach. Is the breakdown of large food particles into smaller pieces or particles. Is the process of breaking down large molecules (proteins, fats, carbohydrates) into smaller molecules that can be absorbed by the digestive tract and used by the cells of the body: chemical alteration of food. Metabolism: process by which your body converts what you eat and drink into energy. Alimentary canal food tube is a hollow tube extending from the mouth to the. Small smooth muscle layer: protection of wall surface from enzymatic action and irritation of food particles. Soft connective tissue with blood vessels, nerve endings, and lymphatic"s: where absorption occurs through blood vessels, muscularis externa smooth muscle.
