KINESIOL 1AA3 Lecture Notes - Lecture 11: Cholecystokinin, Duodenum, Motility

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1AA3
• Professor: Krista Howarth

Document Summary

Forms bolus from chewing food: tongue presses bolus against hard and soft palate, forced posterior into the oropharynx. A reflex initiated by tactile receptors: sends action potentials to the medulla oblongata. Soft palate elevates: blocks passageway to the nasopharynx. Larynx and pharynx elevates: to receive the bolus. Pharyngeal constrictors contract: moves bolus from pharynx to esophagus. Vestibular fold, vocal fold and epiglottis: blocks the opening to the larynx. Upper esophageal sphincter relaxes: allows food to enter the esophagus. Peristaltic contractions: moves the bolus towards the stomach, also helped by gravity. Wave of relaxation: before the bolus. Followed by a wave of contraction: behind the bolus. Functions of the stomach: storage and mixing, not digestion. Cardiac region: where the esophagus enters the stomach. Lower esophageal sphincter: controls opening to the stomach. Fundus: left/ superior to the cardiac region. Pyloric part: pyloric antrum the wider part of the funnel, pyloric canal the narrow part of the funnel.