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33 Cards in this Set

  • Front
  • Back
Motility of the GIT, types of movementsL
1- Mixing movement.
2- Propulsive movement.
Exocrine glands
Endocrine glands
Ex: Digestive juices.
En: Gastrointestinal hormones.
the distensibility and elasticity of the GIT is provided by
the submuscosa
The layer containing the meissner's plexus
The submuscosa
The layer containing the myenteric plexus
the muscularis
The muscularis consists of
an outer longitudinal layer
an inner circular layer
The layers of the GIT, outwards inwards:
1- Serosa.
2- Muscularis:
a- outer longitudinal.
b- myenteric plexus.
c- inner circular.
3- Submucosa.(meissner's plexus)
4- Mucosa.(endocrine, exocrine + epithelial cells)
Where is the mascularis made of striated muscles?
1- Pharynx.
2- Proximal half of the esophagus.
where can an extra oblique layer be found?
1- Stomach.
What's so special about the muscularis of the colon?
They form three bundles:
Tenia coli.
Protection of esophagus against any acidic gastric reflux
mucous secretions
Ingested food + gastric secretions
Juice secreted by the small intestine
succus entericus
The myenteric plexus mainly controls the
muscular layer
The submucosal plexus mainly controls the
secretory epithelium and hormone secreting cells
a muscle layer that has a myogenic activity
the circular muscle layer
the UES is supplied by
The vagus nerve
The EAS is supplied by
The pudendal nerve
What is the parasympathetic supply of the GIT
It's all supplied by the vagus nerve except for the distal colon which is supplied by the pelvic nerve
What are the effects of the sympathetic stimulation on the GIT
1- Vasoconstriction of splanchnic blood vessels.
2- Enhacement of electrolyte absorption through the wall.
3- Relaxation of the wall.
4- Contraction of the circular muscle of sphincters.
Factors that maintain the tonic contractions of the GI sphincters
alpha adrenergic or cholinergic effects
Factors thatr relax the sphincters
beta adrenergic or NANC effects.
circulation to their target cells
interstitial fluid nearby cells
interstitial fluid secretory cells
restricted to synaptic regions, neurotransmitters or neuromodulators
How does the gastrin family act
by secreting the calcium from the endoplasmic reticulum
How does the secretin family act
activating adenyl cyclase to convert ATP to cAMP
The cells that secrete gastrin
G cells of the antral mucosa and duodenal mucosa
The cells secreting cholycystokinins
I cells of the duodenum and jujenum
Secretin is secreted by
S cells in the upper intestine
Hirschprung's disease
Hirschprung's disease
absence of ganglion cells