NFS 043 Lecture Notes - Lecture 3: Pancreatic Juice, Pylorus, Gastrointestinal Tract

• School: University of Vermont
• Department: Nutrition and Food Sciences
• Course: NFS 043
• Professor: professorlizzypope

Document Summary

> pancreas releases glucagon: hunger is the physiological need for food, digestive tract sends message to the hypothalamus through hormones, causes stomach to increase contractions. Cortex picks up signals from the hypothalamus and can listen or override: we have an inborn preference for sugar, salt, fat, the digestive tract is a flexible, muscular tube that is 26ft long. Digestion in the mouth: mechanical = chewing, saliva added /// chemical = amylase in saliva breaks starch down, salivary lipase initiates fat digestion, saliva neutralizes acids. Digestion in the small intestine: chemical = peristalsis moves food along /// chemical = hormones signal for bile release from gallbladder & emulsifies it. Hormones signal for pancreatic juice containing bicarbonate to neutralize stomach acid. Pancreatic and intestinal enzymes break down food into small pieces, walls of small intestine have digestive enzymes for final food breakdown. Small pieces of nutrients are absorbed by the intestinal cells to be carried to other cells.