Week Two Summer 2010 Short Course: Food and Science: Anatomy and Physiology

Week Two Summer 2010 Short Course: Food and Science: Anatomy and Physiology: "FOOD AND SCIENCE SCHEDULE AND ASSIGNMENTS Barbara E. Goodman, Ph.D. (barb.goodman@usd.edu or 605-677-5158) July 12-16, 2010 Tuesday Ju 13 H..."
1. The four true hormones are gastrin which is secreted by the endocrine cells into the stomach and increases the gastric motility. This happens as soon as food appears. The second is acetylcholine which is a neurotransmitter for the parasympathetic nervous system so we are in the rest and relax mode. The third is secretin which neutralizes acid coming from the stomach with bicarbonate. The fourth is cholecystokinin which causes contraction of gallbladder for digesting of fat, releases of enzyme from the pancreas.

2. The gastrocolic reflex is one of a number of physiological reflexes controlling the motility or peristalsis of the gastrointestinal tract. It involves an increase in motility of the colon in response to stretch in the stomach and by products of digestin in the small intestine. This reflex is responsible for the urge to defecate following a meal.