Flashcards in GI4 Deck (47):
what are the lubrication components of saliva?
what are the bactericidal components of saliva>
what are the digestion components of saliva?
lingual lipase (juveniles)
what are the cooling components of saliva?
what is the general structure of the salivary gland?
compound tubuloacinar gland
what is the tenecity of saliva in nonruminants?
what produces the primary secretion of saliva?
what part of the salivary gland has Na and CL reabsorption?
what is the tenecity of ruminant saliva?
what type of secretion is from the parotid salivary gland?
what type of secretion is from the submaxillary gland?
what type of secretion is from the sublingual gland?
salivary serous acinar cells secrete a ___ fluid that contains both ___ and _____
salivary ductal cells reabsorb ___ and __ but not ___; final saliva is ____ relative to plasma.
primary acinar scretions are ____
Na+ absorption/modulated by what?
ruminant saliva is high in ___, ___ and ___
-PO2-4, HCO3-, pH
conditions impeding salivation result in what in ruminants?
what are PS stimulations of the salivary gland
what are the sympathetic stimulations of salivary glands?
is there endocrine regulation of salivation?
what is the glandular mucosa of the stomach?
what is the function of the surface epithelial cells of the stomach glands?
secrete thick mucous and HCO3-; protective function
what is the function of the mucous neck cells of the stomach glands?
secrete thing mucous; cells division
what is the function of the parietal (oxyntic cell) of the stomach gland?
HCl secretion; intrinsic factor secretion (require for B12 absorption)
what is the function of the stem cells of the stomach gland?
what is the function of the chief (peptic) cells of the stomach glands?
what is the function of the endocrine cells (including enterochromaffin-like cells) of the stomach gland>
secrete regulatory substances (eg. somatostatin, gastrin, histamine, serotonin)
what are the properties of the glands of the cardia?
secrete only mucous
what are the properties of the glands of the antrum?
-no parietal cells
- D cells (somatostatin secretion)
-G cells (gastrin secretion)
-chief cells (secrete pepsinogen)
parietal cells HCl secretion properties
-isotonic HCl secretion
-H+ extrusion is achieved actively
-HCO3- reabsorption; "alkaline tide"
___ and ___ enable release of histamine
gastrin and ACh potentiate histamine release, thereby increasing __ ___ ___ __
-parietal cell HCl secretion
what is the role of somatostatin?
inhibition of histamine-stimulated HCl secretion
in the corpus, what two factors regulates somatostatin secretion?
neural and endocrine factors
in the antrum, what stimulates somatostatin secretion?
-low luminal pH and gastrin
somatostatin inhibits the release of what?
pepsinogen becomes what?
pepsin (active form)
what causes more release of pepsinogen?
low pH and pepsin (positive feedback)
gastrin secretion falls
gastrin secretion ceases
what is the basal phase of gastric acid secretion?
what is the cephalic phase of gastric acid secretion?
what is the gastric phase of gastric acid secretion?
initiated by stomach distention
what is the intestinal phase of gastric acid secretion?
small but significant
what is the primary hormonal stimulus for acinar secretion?