Epithelial Tissue Flashcards
Adherins Junctions Structure?
Plaque –> Catenins –> Catenins –> Plaque
(no filament attachment).
Plaque made from glycoproteins.
Connexons Structure?
2 connexins form a channel = connexon.
Small molecules can pass through.
How big a molecule will connexons allow to pass through?
1 kDa
Desmosome structure?
intermediate filament(keratin) - plaque - catenin keratin spans the entire cell so strong and can prevent pulling apart.
Tight Junctions structure?
occludin and claudins “sew” cells together
Where are Tight junctions found?
gut, bladder, stomach
what do adherens junctions do
prevent cell separation.
hemidesmosome structure
BM - laminin - integrin - plaque - keratin
what do desmosomes do
prevent pulling apart
Basment membrane layers
reticular (bottom) and basal (top)
what is the basal laminar secreted by?
what does it contain?
epithelium
collagen + glycoproteins/proteoglycans + laminin (as it attaches via hemidesmosomes)
what is the reticular laminar secreted by?
what does it contain?
fibroblasts
fibrous molecules - fibrinogen and collagen
what are the 2 specialised types of simple squamous epi?
mesothelium - lines pleural cavities to form serous membranes e.g. pertoneum, pericardial, pleural cavities.
endothelium - lines blood and lymphatic vessels - transport vessels.
where are simple cuboidal epithelial tissue found?
pancreas thyroid retina kidney tubules (distal and proximal) ovary lining
where can we find simple columnar tissue?
ciliated: fallopian tubes lower respiratory tract - bronchioles CSF - central canal of spinal cord non ciliated: gut gall bladder ducts
