Digestive system Flashcards
(190 cards)
how long is the GI tract, and what structures define it’s beginning and end?
23 feet long (in a live person)
mouth to anus
segmentation is primarily d/t
inner circular smooth muscle later of the GI tract
what is responsible for peristalsis
outer longitudinal
what type of cells absorb nutrients in the GI tract
simple columnar
four layers of the GI tact
mucosa, submucosa, muscularis, serosa
what type of cells makes up the mucosal layer?
simple columnar
what is the connective tissue that lies under the basement membrane of the GI tract?
lamina propria
what is the thin layer of smooth muscle in the mucosa of the GI tracts called
muscularis mucosa
what type of epithalial cells are in the mucosal layer in the mouth, pharynx, esophagus and anus
stratified squamous
the simple columnar cells found in the majority of the intestines contain intracellular…..
tight junctions
the cells of the intestines are replaced every…
5-7 days
what type of connective tissue is found in the lamina propria of the mucosa?
loose areolar
what are the vessels and nerves in the lamina propria are called:
MALTS: mucosal associated lymphoid tissue
submucosa consists of what type of connective tissue (and what do you find here)?
loose areolar.
arteries, veins, nerves and lymphatics
The part of the intrinsic nervous system of the GI tract (enteric nervous system) found in the submucosal layer is the:
submucosal plexus (Meissner’s plexus)
what is the function of the submucosal plexus? (Meissner’s plexus)
increase secretion from glands
the true muscular layer of the (majority of the) GI tract has what two layers:
a circular inner layer and an outer longitudinal layer
The portion of the enteric nervous system found in between the circular and longitudinal layers in the GI tracts is termed the
myenteric plexus (Auerbach's plexus) (it innervates both layers)
type of muscle tissue found in the tongue, oropharynx, larynx and 1/2 of the esophagus
skeletal muscle
the outer layer of connective tissue in the GI tract is called:
serosa
parasympathetic innervation of the GI tract is via the:
vagus nerve and spinal curve segments S2, 3 and 4
the effect of the vagus nerve and S2-4 is to…
increase the activity of the gut
the sympathetic innervation of the GI tract has what effect
decrease activity of GI tract
The serous membrane that is adherent to the coils of the intestine is :
the visceral peritoneum