GI Innervation and Regulation Flashcards
What is the function of the GI tract?
To provide the body with water, electrolytes and nutrients
What four factors are required for GI function?
motility
secretion
digestion
absorption
What factor moves ingested food from mouth toward rectum?
motility
What factor aids in digestion and absorption?
secretion
What factor breaks down food into absorbable molecules?
digestion
What factor absorbs nutrients, electrolytes, and water?
absorption
What are the GI Tract organs in order?
- oral cavity
- pharynx
- esophagus
- stomach
- small intestine
- large intestine
Name the layers of the GI Wall in order from inside to outside.
- lumen
- mucosa
- submucosa
- muscularis
- serosa (epithelial tissue layer)
What are the two layers of muscularis?
circular layer
longitudinal layer
What are the two parts of the GI tract extrinsic nervous system?
sympathetic
parasympathetic
What does the parasympathetic nervous system do and name 2 nerves that are a part of it?
excitatory
vagus nerve
pelvic nerve
What does the sympathetic nervous system do?
inhibitory
What are the two parts of the intrinsic (enteric nervous systems) of the GI tract?
myenteric plexus (Auerbach's) submucosal plexus (Meissner's)
What does the myenteric plexus do?
motility
What does the submucosal plexus do?
secretion and blood flow
