stomach Flashcards
where does the greater omentum lie (simple)
greater convex curvature
what covers the stomach
pertinoeum or serosa
describe the smooth muscle layers
outer longitudinal
forms hoops, forming a weak cardia sphincter, form a muclular knot on the lesser curvature
circular
what are the depressions in the mucosa
gastric pits
what cell type lines the glandular region
what is their main function
simple columnar
mucous producing - protective coat
what do gastric glands secrete
(gastrci juice)
pepsin
HCL
what are the different columnar cell types
mucin producing
parietal
chief
endocrine
what are the functions of parietal cells
secrete HCl to degrade tissue, kill microorgansims
activates pepsin
what are the functions of chief cells?
secrete pepsinogen (the inactive precursor of pepsin)
pepsin degrades proteins
what is the function of gastrin
stimulates HCL and Pepsinogen secretion after a meal
what is the function of the simple stomach
temporary food storage
degredation of protein and starch
HCl kills bacteria
what cell type lines the proximal stomach
stratisfied squamous epithelium
what is the function of the proximal stomach
tonic contraction
receptive relaxation when s=full to stop expulsion
what is the function of the distal stomach
active peristalsis
pyloric wall contraction to increase pressure forcing chyme out the sphincter
how is hcl inhibited
when ph of duodenum falls below 2
somatostatin is released to block HCL secretion
