Neuron Transmission: Membrane Potential YouTube Lecture Handouts for Competitive Exams
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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
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 Image-2
Membrane Potential
Resting Potential
Post-Synaptic Potential
Action Potential
Resting Phase (-70 mV)
Stable negative charge of inactive neuron
Resting Phase as Battery
Red (Na+ in) & Orange (K+ out)
Red (Na+ In) and Orange (K+ Out)
Myelin Sheath (Saltatory Conduction – Somersault - Jump)
Myelin Sheath: Action Potential
Myelin Sheath: Action Potential-2
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
-Manishika