Flashcards in Upper GI Histology II Deck (22):
Where does the fundus (base) of gastric glands extend into?
the lamina propria
What are the types of cells found in the gastric glands?
What do mucous neck cells in the gastric glands secrete?
What is the function of stem cells in the gastric glands?
replacement of other cells of the gastric pit
What do chief cells in the gastric glands secrete?
What do partietal cells of the gastric glands do?
manufacture HCl and secrete intrinsic factor
What do enteroendocrine cells do?
they are also known as APUD cells (amine precursor uptake and decarboxylation)
Parietal cells generate hydrogen ions from carbonic acid. What other type of cell also does this?
Parietal cells create vesicles. What type of function dp the tubulovesicle pools have?
They excocytose and endocytose.
What two substances does the enteroendocrine cell secrete?
peptide hormones and serotonin
The surface area of the small and large intestine are increased by what structures?
What are plicae?
Folds of the mucosa that have a submucosal core
Each villus contains a core of what?
Where do the crypts extend down between?
the villi below the bases of the villi
What constitutes glands of the small intestine?
crypts and villi
What does each villus form?
a capillary plexus
What is a lacteal?
A blind-ending lymphatic found in each villus
What is the microvilli covered with?
glycoprotein and glycocalyx
What does the glycocalyx of the microvilli contain?
brush border enzymes:
maltase, sucrase, isomaltase, lactase, lipase, peptidases
The microvilli is supported by a core of what cytoskeletal component?
How are actin filaments bound to each other?
via actin cross-linking proteins
villin and fimbrin