0:00
Hello everyone.
00:01
So in this particular question, we are asked questions about the cell membrane and the transport of the cell membrane according to the structure.
00:08
So the first part of the question says that the cell membrane, it has a lipid portion that is acting as a barrier to a hydrophilic substances.
00:18
So first of all, we should know that by lipid molecule when we are talking, so it is having a hydrophilic head that is water loving.
00:28
And we are having a hydrophobic tail that is water repelling.
00:33
So what happens that as we know that there is a lipid bilayer, so the two lipid molecules, they are arranged as such so that the hydrophobic tail they are facing each other and the heads they are towards the exterior and the interior of the sip.
00:53
So as these structures are hydrophilic molecules, that is they are water loving so the water loving substances because of this structural arrangement the hydrophilic substances that are water loving are kept to right these molecules they are kept to the exterior of cell right they are not allowed the entry is not allowed for hydrophilic substances even if they want to enter they will require a help of transport protein through carrier protein or the journal proteins so now the next part of the questions is that we need to tell the substances that are allowed to pass the membrane so the substances that are allowed to pass the membrane are water oxygen and co2 why simple diffusion right small lipid molecules they are allowed through simple diffusion and large polar molecules they are allowed with the help of carrier proteins right they are allowed with the help of carrier proteins so this was all about the first two questions now we need to discuss that what are the substances that cannot pass the membrane right so here we need to discuss about this that cannot pass the membrane so in the first part of the question we just discussed that the hydrophilic substances, they are kept to the exterior and they are not allowed in the interior of the cell.
02:35
So now the second part of the question, in the next part of the question we need to tell that how proteins they make the membrane semi permeable and we also need to tell the role in homeostasis.
02:49
Right...