PSL301H1 Lecture Notes - Lecture 27: Muscularis Mucosae, Intestinal Epithelium, Ileocecal Valve

• School: UTSG
• Department: Physiology
• Course: PSL301H1
• Professor: French, Gramolini, Richardson, Wong

Document Summary

Digestive system lecture 1: digestive system overview of function and structure. Food moves through the gi tract propelled by waves of muscle contraction. Mouth: the mouth is the receptacle for food. The pharynx: the pharynx receives the bolus of food from the mouth, and the swallowing reflex is initiated. It pushes the food into the esophagus: the lateral surfaces are very flexible in the epithelial wall of the pharynx. The esophagus: swallowed food first passes into the esophagus, a narrow tube that travels through the thorax to the abdomen. The upper esophageal sphincter is at the top of the esophagus. The stomach is divided into three sections: the upper fundus, the central body, and the lower antrum. The small intestine is divided into the duodenum, jejunum and ileum: digestion is carried out by intestinal enzymes, aided by exocrine secretions from the pancreas and liver (via gall blader) Liver bile salts; pancreas bicarbonate, enzymes. Makes the duodenum amenable for functioning enzymes.