LIFESCI 2N03 Study Guide - Midterm Guide: Ad Libitum, Dysbiosis, Irritable Bowel Syndrome
14 Oct 2017
School
Department
Course
Professor
Document Summary
Gastrointestinal tract (gi tract): exible muscular tube, going from mouth to anus. Role of mouth in digestion salivary enzymes such as amylase begins digestion of amylose lower esophageal sphincter opens when a bolus of food arrives, allowing food to pass through esophageal hiatus to stomach. Role of stomach in digestion take bolus and turns it into chyme. Perstalsis and segmentation peristalsis: construction and relaxation of gi tract to propel food along segmentation: contractions in the intestines that help absorb food and pass it along. Role of large intestine in digestion and absorption ileocecal sphincter opens to allow contents to enter large intestine from small intestine protein, carbs and fat have now been digested water and salts reabsorbed in large intestine. Saliva: small contributor, enzymes initiate digestion target organ: mouth secretion from: salivary glands. Gastric juice: contain water, enzymes, hcl. ph=2, prevent bacterial growth, salivary enzymes inactivated here target organ: stomach secretion from: gastric glands.
