00:03
Hello everyone.
00:05
The question is how oxygen crosses cell membrane? is it through osmosis, coronets, non -specific transporter, facilitated diffusion or simple diffusion? but before getting into how oxygen crosses cell membrane, let us know about the choices that is given.
00:24
So the osmosis is nothing but it's each movement of water across the cell membrane against the solute concentration and the porins would be a porons are nothing but as shown in the diagram it's a protein barrel that is uh it the barrels would form the exterior and the core would be empty such that any large molecule could enter and exit this corin it will go into like this like inside this empty core it will transfer this is a transport of and the porons are nothing but it's a proton barrier.
01:02
So this is how when molecule could cross a cell membrane through porous.
01:06
If it is a porin, it would be present like this with an empty core and this molecule would transfer.
01:12
For a, these forums are used for transfer of large molecules across the cell membrane or any charged more than charged molecule.
01:21
It is based on the size.
01:23
If it is a very large molecule, then it is transported through porins.
01:28
And the next one is non -specific transport.
01:32
So again let me put it in the diagram.
01:37
So non -specific transporter is nothing but a transporter.
01:41
It is also a protein again which spans the cell membrane like this.
01:46
So this function is to transport any molecule across the cell membrane.
01:53
This function is similar to that of chlorines but non -specific means it is not specific to any molecule.
02:00
For specific transporter means it would specific transporter means it would specific bind to chlorine molecules.
02:05
Specifically, those transporters are specially designed to bind to only such molecules.
02:12
Whereas nonspecific transporter do not have any such condition, they can freely transport any molecule across the cell membrane.
02:21
So this is the non -specific transporter and i would like to combine the facilitated diffusion.
02:27
It's a process.
02:28
It's a diffusion, it's a passive diffusion process.
02:32
But facilitated.
02:32
Diffuted diffusion means it makes use of a transporter.
02:37
So, it may either it can be nonspecific transporter or a specific transporter...