00:01
A cell junction is a specialized structure within the cell that's going to allow them to communicate with other cells, allow them to interact and adhere with other cells, all within a multicellular organism.
00:14
Let's talk about the three types and then we'll compare and contrast them.
00:18
The first type is going to be what we call a tight junction.
00:25
A tight junction is consisting of an integral membrane proteins like your occludins or your clodins, and they link adjacent cells together tightly.
00:43
It's going to form a continuous barrier.
00:47
What this does is seal the intercellular space between those cells and prevents the passage of ions and molecules, which really helps with selective permeability.
00:56
These can be found in epithelial tissues that line the digestive tract, the urinary bladder and blood -brain barrier.
01:17
Now, another type of cell junction are desmosomes.
01:27
You might also hear these called macula adherens.
01:30
A desmosome, what it does is it's characterized by protein plaques on the inner surface of the cell membrane, and they're connected by protein filaments that we call adherens, which extend into adjacent cells.
01:46
So i'm going to say is provide strong adhesion between cells.
02:02
So it anchors them together and distributes mechanical stress evenly between the cells...