Epithelium Flashcards
TJ’s not occulading
paracellular transport
TJ’s are occulading
transcellular transport
apical secretion into ducts and onto free surfcaes
exocrine
basal secretion into CT, acts locally
paracrine
basal secretion into CT, acts in bloodstream
endocrine
1 layer of cell, attached to BM
simple
more than 1 layer of cells, only basal layer attached
stratified
many layers b/t cells are diff. heights, but all cells attached to BM
pseudostratfied
found in bladder and ureter
transitional ep.
comes from mesoderm
contains blood vessels
consists of cells and ECM
connective tissue
fibrils aggregate to form thick, large diameter fibers
do not stretch, critical for tensile strength
collagen
can distend/stretch, contain elastic polymers wrapped with microfibers of glycoproteins
elastic
(mesenchymal stem cells) most abundant
produces almost all ECM
prominent in RER + Golgi
contains euchromatin
fibroblasts (F)
(msc) cytoplasm filled with lipid droplets
clustered in groups = lobules separated by dense irregular CT sleeves
adipocytes (F)
(msc) associate with walls of small blood vessels in CT
stabilize wall of blood vessels
pluripotent
pericytes (F)
