Neuron Transmission: Membrane Potential YouTube Lecture Handouts for Madhya Pradesh PSC

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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