ANP 1107 Lecture Notes - Lecture 3: Vasoactive Intestinal Peptide, Enteric Nervous System, Autonomic Nervous System

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1107
• Professor: Jackie Carnegie

Document Summary

Physiology of the gi system: major digestive processes a, propulsion: mechanical process of moving food through the alimentary canal, includes. Ingestion: refers to the taking in of food to the digestive tract normally via the mouth swallowing (voluntary) and peristalsis (involuntary) Food is subsequently moved through the digestive tract via peristalsis, an involuntary process involving smooth muscle. Most absorption takes place in the small intestine: defecation: eliminates indigestible substances (fecal matter) from the body via the anus, control of digestive function. Regulatory mechanisms act to create optimal conditions in the gi lumen for both digestion and absorption of the products of digestion. The enteric nervous system is the nerve supply of the alimentary canal. It is staffed by enteric neurons that communicate with one another to regulate digestive system activity: regulatory stimuli can be mechanical or chemical. Mechanoreceptors, osmoreceptors, and chemoreceptors are located in the walls of gi tract organs which detect and respond to stimuli: