Flashcards in Lecture 5: histo + structure Deck (32):
What kind of epithelium is found in the intestine?
What kind of epithelium is found in the oral cavity and esophagus?
stratified squamous epithelium
What is the difference between the epithelium of the facial skin and oral mucosa?
facial skin (outside of lip) = keratinized, squamous
oral mucosa (inside of lip) = stratified squamous, non-keratinized
What parts of oral cavity are keratinized?
gingiva, hard palate, filiform papillae
which lingual papillae do not have taste buds?
which lingual papillae are keratinized?
What is the epithelium of the stomach?
What kind of cell types are in gastric epithelium?
Surface mucuous cell
Mucous neck cell
What do each of these cells secrete?
Mucous cells = mucus
Parietal cell = H+, Cl-, IF
Chief cell = pepsinogen, lipase
Enteroendocrine cell = gastrin, histamine, somatostatin
What is the function of surface mucous cells in the stomach?
mucin production to protect against gastric contents (acid)
What's another name for gastric parietal cells?
What is the function of gastric parietal cells?
production of HCl and intrinsic factor
What is the function of gastric chief cells?
produce pepsinogen and lipase
What are functions of the small intestine?
digest carbs, proteins + lipids
neutralize gastric acid
absorb bile acids
produce GI regulators
What kind of epithelial cells are in the small intestine?
What are the functions of enterocytes in the small intestine?
absorptive cells: make up majority!
nutrient digestion (brush border = villi)
conditional electrolyte secretion
What are the functions of the goblet cells in the small intestine?
produce mucus for protection of epithelium (from, for example, microbes)
What do enteroendocrine cells (EEC) do in the small intestine?
secrete GI regulators: serotonin, CCK, secretin, somatostatin, motilin, GIP...
What do paneth cells in the small intestine do?
secrete antimicrobial factors (lysozyme, secreted phospholipase)
Produce growth factors for epithelial stem cells in crypts
Where are Brunner's glands located?
what do Brunner's glands in the small intestine do?
epithelial protective factors
What is the function of the iliocecal junction?
prevents reflux of colon contents into ileum
What cell types are in the colon?
What kind of epithelium lines the rectum? What kind lines the anal canal and the perianum?
rectum = simple columnar
anal canal = stratified squamous, nonkeratin
perianum = stratified squamous, keratinized
What segments of the GI tract contains parietal and chief cells?
stomach antrum (minor)
What segments of the GI tract contains mucous cells?
What segments of the GI tract contains enterocytes/absorptive cells?
What segments of GIT contains goblet cells?
what segments of GIT contains paneth cells?
What are chief products of EEC cells in the stomach
what are chief products of EEC cells in the small intestine?
glucose dependent insulinotropic peptide (GIP)