Neuron Transmission: Membrane Potential YouTube Lecture Handouts for Competitive Exams

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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

Na-K Pump

Na-K Pump

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Na-K Pump Image-2

Na-K Pump Image-2

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Membrane Potential

Resting Potential

Post-Synaptic Potential

Action Potential

Resting Phase (-70 mV)

  • Stable negative charge of inactive neuron

Resting Phase as Battery

Resting Phase as Battery

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Red (Na+ in) & Orange (K+ out)

Red (Na+ in) and Orange (K+ out)

Red (Na+ In) and Orange (K+ Out)

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Myelin Sheath (Saltatory Conduction – Somersault - Jump)

Myelin Sheath: Action Potential

Myelin Sheath: Action Potential

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Myelin Sheath: Action Potential-2

Myelin Sheath: Action Potential-2

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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

All or Nothing Law Image

All or Nothing Law Image

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