Neurons Action Potential Stages Flashcards
What stage of an action potential is described when the neuron is not communicating?
The resting stage
When the neuron is resting where are the positive sodium ions?
Outside the neuron
Why are positive ions trying to get into the neuron?
Because there are negatively charged proteins inside the neuron and opposites attract
What goes back and forth inside and outside the neuron?
Potassium k+
What mV is the resting stage?
-70mV
What is the natural polarization of the neuron?
-70mV
Why does the polarization change in the neuron?
Potassium K+ goes back and forth.
What is the first stage of and action potential? That sparks the electrical activity to occur
The threshold stage
What is the estimated mV charge in the threshold stage?
~40mV
What stage has sodium outside, potassium more inside than outside and mV charge is ~40mV
Threshold
Second stage of action potential?
Depolarization
When the regular polarization of a neuron is negative, changing the polarization to positive charge is what stage of the action potential?
Depolarization+mV
What is the only stage of an action potential where there is a positive +mV charge?
Depolarization
The neuron does not like to be depolarized so when it tries to restore it’s negative polarization what stage is this in the action potential?
Repolarization
How does the neuron restore its polarization?
By closing sodium ion channels and trapping sodium inside. Potassium starts to leave. Potassium out helps restore negative polarization.
Repolarization
When both sodium and potassium flow into the neuron, creating a huge flow of positive polarization, what stage of the action potential is this?
Depolarization
What stage happens after the repolarization stage has done too good of a job creating a negative polarized to communicate?
Hyperpolarization
What stage has too many sodium in and too many potassium inside of a neuron? Flipped polarization paused communication
Hyperpolarization
When the neuron is too negatively polarized which stage helps the neuron restart the action potential?
Sodium Na+/potassium k+ pump
What stage is the sodium/potassium pump?
The 5th stage
What stage is is the threshold stage of an action potential?
The 1st stage
What stage is the depolarization of an action potential?
The 2nd stage
What stage is the repolarization of an action potential?
The 3rd stage
What stage is the hyperpolarization of an action potential?
The 4th stage
What happens before and after action potentials?
The resting stage
