KINS 1224 Chapter Notes - Chapter 25: Sodium-Glucose Transport Proteins, Ghrelin, Osmosis
30 Jan 2018
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Document Summary
Organ system that processes food, extracts nutrients from it and eliminates the residue. Digestion: mechanical and chemical breakdown of food into usable form. Absorption: uptake of nutrient molecules into the epithelial cells of the digestive tract and then into blood or lymph. Compaction: absorbing water and consolidating the ingestible into feces. Responsible for the motility that propels food and residue through digestive tract. Amount changes on what time of day it is. Secretion starts and hour before you"re about to eat. Parasympathetic ganglia and nerve fibers of the muscular is externa. Translucent 2 layered membrane extending to the digestive tract. Hang freely or attach to abdominal wall or other organs. Prevent small intestines from becoming untwisted with changes in body position. Motility and secretion controlled by neural, hormonal, and paracrine mechanisms. Sensory signals -> brain stem -> motor commands to digestive tract. Unstimulated: keep mouth moist and lysozyme inhibits bacterial growth. Involves 22 muscles in the mouth, pharynx and esophagus.
