00:03
To answer this question, let's talk about the cell membrane, okay? it says, which following is not true regarding wasting memory potential? remember that the resting memory potential is the potential at which the potential of the cell membrane when the cell is wasting.
00:20
It means when action potential is not occuring.
00:22
Normally, this is the millivoles of the potential of the membrane, and this is the time.
00:29
This is like about minus 70 millibolts is a wasting membrane potential.
00:34
So you have here the wasting membrane potential.
00:37
Now when you want to start an action potential, there is going to be a stimulus and that stimulus is going to rise the voltage.
00:45
But action potential is not going to cure unless this voltage reaches the threshold potential that is here.
00:52
So let's suppose that it is minus 60 millibolt.
00:56
So if they have the action potential or absolutely the voltage, does not wish this threshold potential, then action potential is not going to cure.
01:05
Okay, if it is not going to cure.
01:07
And what determines this wasting memory potential? well, the wasting memory potential is given by a pump here that is called the sodium, potassium, atpas, and also some potassium leak panels, okay? it means just ion channels that move potassium continuously.
01:28
And this is a type of active transport that moves three sodium ions out of the cell in exchange by two potassium ions inside a cell.
01:38
So let's answer question one.
01:40
It says which of the following is not true regarding resting memory potential? so we're looking for the false one.
01:45
Option a says the sodium potassium pump maintains an equal distribution of sodium and potassium ions on either side of plasma memory.
01:55
And this option, option a is going to be it is true, okay? because, as i told you, this sodium potassium atp pump moves three sodium ions inside of a cell, i'm sorry, outside of the cell in exchange by only two potassium ions inside of a cell.
02:14
So this is unequal, okay? option a is true.
02:18
Option b says for every three sodium ions that are pumped out of the neuron, two potassium ions are pumped into the neuron, and this is true.
02:26
We already said that because of the sodium potassium atp pump.
02:30
Option c says sodium lithium lithium lithium atp pump...