PSYCH 1XX3 Study Guide - Quiz Guide: Neurotransmitter
3 May 2016
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Steps in the action potential: the resting potential (-70mv) K+ on the inside & diffusion forces it outside: reaching the threshold (-50mv) K+ on the inside & diffusion forces it outside. Threshold is reached via epsp summation: neurotransmitter comes & binds to a receptor on the post-synaptic terminal opens ligand gated na+ channels (na+ rushes in, increasing the positive charge, this is why depolarization happens up to -50mv. Temporal summation: one after the other on the same synapse (multiple times) slow rise to -50mv. Spatial summation: happens all at once, but from different locations, action potential the rise (+ 40 mv) K + moves outside the cell caused by diffusion & electrostatic forces: action potential the fall (0mv reaches zero & falls to become more negative) K + outside the cell: refractory period (-100mv) Opposition of resting state: return to resting potential (- 70mv) Overshoot inside is getting more negative because you are losing positive ions (k +) na.
