Transport 9- Epithelial transport

Published by Darron Toy on

now I want you to take a second I mean we've got transporters we have this visual of let's just I'm going to take a little bit more time but sometimes I draw my transporters as circles that lets you go ahead and visualize your you know your whatever shape it's going to be is it a channel is a transporter like this different flavors of transporters but sometimes you don't have to draw all the crazy details I usually try to remember to draw my cell membrane with two why why are there two lines representing that cell membrane because that's actually my phospholipid bilayer and I'm drawing it this way for you so that you can see that sometimes this is familiar to you dude really when I just drag a couple boxes dang it and now I'm gonna have to mess with it anyway what else did I just draw right here ignore all this stuff in the middle okay like that I just drew two transporters and okay usually there's no way on the planet I'm ever gonna draw my double layered thing what in the world am i drawing somebody please send some help what is this okay and guess what it's a cell lining your intestinal tract which means that this is the lumen aren't you happy you had Anatomy piece of cake you know that epithelial tissue so I'm going to make a little note that this is an epithelial cell epithelium lines the Luminess is probably a simple cuboidal cell this is my I'm gonna have some connective tissue down here and ultimately I'm gonna absorb a molecule if I'm going to get something from the outside in the lumen into the cell if I want to get that thing for example into let's just say the stream this is a blood vessel of course it is if I want to do that how many cell membranes am I gonna have to pass – actually I'm gonna have to pass another one because I'm gonna have to pass through the cell membrane huh I'm gonna have to pass through another layer of epithelial tissue okay so the whole point is we don't often we'll just transport molecules in and out of the cell but often we have to transport molecules across layers of epithelial tissue usually the tissue is simple when we do that usually it's just one layer of epithelium not a problem bring it in cross two cell membranes to get it in cross two more to get it into the lumen of the blood vessel and now it's in the blood now let's take it somewhere if we want to go backwards and dump whatever that was that we just absorbed into a responding cell we're gonna have to do that here I brought you lunch we're gonna have to cross two more layers of epithelium we're gonna have to cross out of the two layers to get to more cell membranes in order to get into the interstitial fluid two more so one more cell membrane to get into the cell itself did you even like that's called epithelial transport and it's you don't want to forget that to get things inside our body we're gonna have to transport them there some things will diffuse right in but often we have to have transporters and we can team up our transporters in different combinations to get this to happen over and over we're gonna see it and we're going to identify our different transporters and then go yeah that totally makes sense that if we have those transporters in those places we would get the movement of molecules basically completely through the cell to enable absorption okay there's one more form of transport that we didn't talk about and that's phagocytosis this cell itself or endocytosis or exocytosis the cell membrane itself can actually like create a little bubble do you see what is happening here and then it pinches off and whatever was outside is now inside this concept is pretty standard but we're gonna see that yeah this is going to be important in understanding physiological function oh my gosh that's it for the lecture on transport next up is how cells communicate with each other that's exciting

1 Comment

Simarjot Singh · May 15, 2019 at 9:31 am

Hi Wendy, would it be possible to make a video which discusses epithelial transport in detail please?

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