00:01
In order to answer this question, let's talk about cell transport.
00:04
If this is your cell membrane, you're going to have here, for example, facilitated diffusion and also simple diffusion.
00:10
Simple diffusion occurs when a molecule across the cell membrane without the requirement of any protein.
00:16
It means without help.
00:17
And these are going to be for molecules that are lipid soluble, also for molecules that are small, and for molecules that are poorly charged.
00:26
While you have also some other molecules that are going to move across a cell, also down a concentration gradient as this type of cell transport, but in this case, those molecules are going to acquire a protein.
00:41
And why? well, because they are going to be soluble, they are going to be big like glucose, or they are going to be heavily charged like ions.
00:48
So in those situations, those molecules are going to use protein, proteins, okay, in order to help them to move across a cell membrane.
00:57
And as i told you here, facilitated diffusion, similar to simple diffusion, both are going to move substances down the concentration gradient.
01:06
In case of active transport, you're going to use proteins, protein pumps, and those pumps are going to move substances after the concentration gradient.
01:15
It means from lower concentrations to higher concentrations, this is up the concentration gradient, and also you're going to acquire atp.
01:21
While here you didn't acquire atp.
01:25
So this question says, classify the phrases based on whether they describe or give an example of simple diffusion, a facility of diffusion, primary active transport or secondary active transport.
01:37
Primary active transport is this one here.
01:39
In secondary active transport is a type of transport where you use also atp, but not directly like here.
01:47
For example, in this case, you use atp directly, but in secondary active transport you're not going to use atp direct.
01:53
For example, if this is your entero -side, normally you're going to have a a transporter here.
01:59
This transport is going to move glucose inside of a cell, but this glucose is going to work or is going to be transported by this protein inside a cell only in the presence of sodium, specifically two sodium ions.
02:15
Okay? so once your sodium is here, it is going to move together with glucose inside of a cell, then if glucose is going to get to the blood and this sodium is going to be pumped back to the extracellular by this primary active transport that is atp, the sodium potassium atp is pumped, okay? and this pump is going to pump sodium back to the extracellular and it is going to, this sodium is going to help more glucose molecules in order to like to move inside of the cell.
02:45
So as you can see here, atp is not required here, but the energy in order to to produce this, the secondary active transport is coming from.
02:53
This primary active transport that is moving sodium and it is creating a gradient of sodium in order to pump this glucose molecules inside of a cell.
03:02
So let's go for the first option that says transport of hydrogen ions into the isosome driving by hydrolysis of atp and this is going to be for active transfer because you are using atp, specifically primary active transport...