Compléter neurophysVersion en ligne neurphys par kenneth thomas 1 into Sodium Potassium K cannot strength diffusion Na stimulus Action Potential : Inside the celli s * and MG * * Outside the cell is * and Cl * . Stimulation increases membrane permeability to sodium . Passive depolarization : Na * goes into the cell by creating a change in electronegativity . K * goes out of the cell . Cl * goes the cell . Decreased membrane permeability to Na , K and Cl . Active transport : goes out of the cell . goes into the cell . Repolarization occurs due to increase potassium conductance . Moves back to resting membrane potential . Resting membrane potential : Muscle - 90 MV Neuron - 70MV Absolute Refractory Period : When a second action potential be elicited . Relative Refractory Period : When a second action potential can be elicited , but must be a greater than the first . Rheobase : Minimum current for an action potential to occur . Chronaxie : Time needed using 2x the rheobase for excitatio n
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