BMS_260_WeeklyNotes.pdf BMS 260
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Popular in Biomedical Sciences
This 2 page Class Notes was uploaded by Mikaela Maldonado on Friday April 15, 2016. The Class Notes belongs to BMS 260 at Colorado State University taught by Dr. Russell Anthony in Spring 2016. Since its upload, it has received 11 views. For similar materials see Biomedical Sciences in Biomedical Sciences at Colorado State University.
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Date Created: 04/15/16
Anatomy of the Digestive System Musculomembranous tube – mouth to the anus 4 major function of the digestive system prehension – taking food in mastication – chewing ; salivation swallowing digestion motility absorption secretion secretion/absorption 1200mL water/day ingested 1500 mL salivary secretions 500 mL bile/1500mL pancreatic secretions 1500 mL intestinal secretions 6500 mL absorbed through small intestine mouth, pharynx, esophagus esophagus – connects the pharynx to stomach both smooth and skeletal muscle smooth – inner circular layer, outer longitudinal layer upper esophageal sphincter – striated muscle salivary glands – 3 pairs in humans helps with mastication/swallowing stomach esophagus fundus cardiac and esophageal regions body secretes mucus, pepsinogen and HCl Antrum Secretes mucus, pepsinogen, and gastrin Smooth muscle Circular Longitudinal Oblique Gastric glands Lymph system is closely associated Gastric pit Opening into gland Mucus cells Parietal (oxynotic) secrete HCl Chief cells – secrete pepsinogen Endocrine cells Stomach could be considered an endocrine gland in secretions back to the blood Small intestine secretions Duodenum Jejenum Ileum Enteric nervous system Autonomic nervous system Myenteric plexus – lays between longitudinal/circular smooth muscle Submucosal plexus- lies between circular and submucosal layers Glands can be outside of gut (pancreas) or within submuscosa (Brunner’s) aka duodenal Crypts of Leiberkhan Secrete enterokinase and some amylase Small intestine has true villi – large intestine doesn’t Duodenum mainly absorbs glucose and amino acids Large Intestine Ileum – cecum (appendix) – ascending – transverse – descending – sigmoid – rectum Does not have true villi Does not have crypts Final absorption of water/electrolytes Non ruminants – caudal fermenters Horse has the largest cecum Dog has the shortest cecum Salivary glands 3 pairs parotid (ear) – serous sublingual (front under tongue) – mixed secretions maxillary/submandibular (back towards jaw) – mixed secretions secretions- serous – mimics blood plasma mucus ruminants have an extra pair inferior molars saliva moistens and lubricates food small digestion of polysaccharides by amylase Pancreas Located underneath the liver
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