00:01
Okay, this question here says, increased potassium current leads to hyperpolarization and prolonged atrial action potential, true or false? and the answer here is going to be false.
00:12
Okay, so in general, i'm going to draw here like a general graph for the action potential.
00:18
Okay, but remember that we have different types of action potential.
00:21
For example, the action potential in the sinus node is different from the action potential in the skeletal muscle or in the cardiac muscle.
00:28
Okay.
00:29
So in this case, you will have this.
00:32
Here you have the aggressive magnetic potential that is going to be minus 70 millivolts, i suppose.
00:36
Okay.
00:37
And here you have the threshold potential that may be minus 60 millivolts.
00:42
And this threshold potential is the potential necessary for the cell.
00:46
It means the cell needs to reach this voltage in order to trigger an action potential.
00:50
And this is the aggressive magnetic potential.
00:52
Okay.
00:52
So this is the potential of the cell at rest.
00:54
So in order to trigger the action potential, some sodium channels must open because sodium is higher in the extracellular than in the intracellular.
01:02
So if you open sodium channels, sodium are going to enter the cell...