Home
Flashcards
Preview
Digestive System
Home
Get App
Take Quiz
Create
Automatically remove your image background. Try it now!
https://remove-image-background.com
Functions/Processes of the Digestive System
Mechanical Digestion
Chemical Digestion
Propulsion
Absorption
Most contractions are rhythmic which are triggered by frequencies of “___” membrane potential in smooth muscle of the GI tract.
slow wave (type of graded potential)
The cause of slow waves is not known entirely but it is thought that specialized cells called “____” act as pacemaker cells for the smooth muscle.
interstitial cells of Cajal
When slow waves reach -40mV a __ (action potential) is generated
spike potential
__ channels open and close slowly causing spike potentials to have long durations (10-20ms): Depolarization occurs.
Ca++/Na+
Factors that make the resting membrane potential more positive include:
Stretching of the smooth muscle
Acetylcholine released from the Parasympathetic Nervous System
Specific gastrointestinal hormones
Factors that make the resting membrane potential more negative include:
Norepinephrine and epinephrine
Two Plexuses
Myenteric (Auerbach’s) Plexus
Submucosal (Meissner’s) Plexus
The myenteric plexus controls __
gastrointestinal movements
The submucosal plexus controls __
gastrointestinal secretions and local blood flow
G cells produce __
gastrin
I cells of the small intestine release __
cholecystokinin (cck)
S cells of the small intestine release __
Secretin
basic propulsive movement of the GI tract
Peristalsis
Parietal cells secrete __
HCl & intrinsic factor
Chief cells secrete __
pepsinogen
Phases of Pancreatic Secretion
Cephalic
Gastric
Intestinal
Automatically remove your image background. Try it now!
https://remove-image-background.com
Author
sophathida
ID
322614
Card Set
Digestive System
Description
Functions/Processes, Electrical Activity of GI Smooth Muscle, Enteric Nervous System, Movement of GI Tract, Gastric & Pancreatic Secretions
Updated
2016-08-24T01:10:40Z
Show Answers
Home
Flashcards
Preview