Neuron Transmission: Membrane Potential YouTube Lecture Handouts for NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.
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Nerve Impulse - 3 Membrane Potential Na-K Pump
Membrane Potential
Neurons – Electrical Charge called membrane potential
Na-K Pump
- Specialized transport protein in cell membranes
- Ions: Charged Particles Na+ has missing electron
- Ion + Protien ⇾ Changes shape of protein
Membrane Potential
Resting Potential
Post-Synaptic Potential
Action Potential
Resting Phase (-70 mV)
- Stable negative charge of inactive neuron
Red (Na + in) & Orange (K + out)
Myelin Sheath (Saltatory Conduction – Somersault - Jump)
All or Nothing Law
- Axon either produces action potential or it does not
- For action potential – Threshold must be reached
- If not, neuron will not fire
- Similar to firing of GUN
- After firing, cannot fire or 1 to 2 millisecond – Absolute Refractory Period
- Then Relative Refractory Period - Neuron will fire only if stimulus is too strong
✍ Manishika