Membrane Potential Youtube Lecture Handouts

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Watch video lecture on YouTube: Nerve Impulse - 3 Membrane Potential Na-K Pump Nerve Impulse - 3 Membrane Potential Na-K Pump
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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