10.5 Overview of the Digestive System Part 2 Flashcards
What nervous system does the enteric nervous system branch from?
autonomic nervous system
What is the purpose of the enteric nervous system?
controls digestion via innervation of the GI tract, pancreas, and gallbladder
What does the enteric nervous system regulate?
blood flow
gut movements
exchange of fluid from gut to and from the lumen
What are the two neuron networks that make up the enteric nervous system?
- myenteric plexus
- submucosal plexus
Where is the myenteric plexus located?
between the circular and longitudinal muscle layers
What is the function of the myenteric plexus?
regulates gut motility
Where is the submucosal plexus found?
in the submucosa
What is the function of the submucosal plexus?
regulates enzyme secretion, gut blood flow, and ion/water balance in the lumen
What are the two types of GI secretions?
endocrine and exocrine
What nervous system inhibits and which stimulates GI secretion?
inhibits = sympathetic
stimulates = parasympathetic
What are acinar cells?
specialized epithelial cells of exocrine glands
What specialized digestive organs perform most of the exocrine secretion of GI tract?
liver, gallbladder, and pancreas
What are two types of specialized epithelial cells that perform exocrine secretion?
gastric glands
goblet cells
Where are gastric glands located and what do they secrete?
stomach; acid and pepsinogen
Where are goblet cells located and what do they secrete?
entire GI tract; mucus
