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CELL JUNCTIONS (Tight
junctions (F
form watertight seal between cells…
CELL JUNCTIONS
Tight
junctions
-
-
S
- plasma membranes fused with a strip of protein
- not a lot of intracellular space
-
Function
-
-
anchor cells together or to extracellular material # # #
act as channels - allow ions and molecules to pass from cell to cell #
Adherens
junctions
F
- hold epithelial cells together
L
- between cells that line GI
S
- plaque - dense layer of proteins inside cell membrane
- actins filaments extend into cytoplasm
- integral membrane proteins connect membranes of two cells (clickers)
-
Gap
junctions
F
- cell communication with ions and small molecules
- muscle and nerve impulses spread from cell to cell
L
- heart, smooth muscle of gut
S
- tiny space between plasma membranes of 2 cells crossed by protein channels called connexons forming fluid filled tunnels
-
Desmosomes
F
- cell-to-cell stability
- stability in tissue formation
-
S
- similar to adherens
- connects to intermediate filaments within cytoplasm of two connected cells with cadherin transmembrane glycoprotein
-
Hemidesmosomes
F
- cell-to-cell basement membrane stability
L
- any cell attached to basement membrane
S
- half a desmosome - same structure
- connects cell to underlying basement membrane and extracellular material using integrin transmembrane glycoprotein (not cadherins)
-
-
