PSY 250 Lecture Notes - Lecture 3: Voltage-Gated Potassium Channel, Postsynaptic Potential, Axon Hillock

• School: Stony Brook University
• Department: Psychology
• Course: PSY 250
• Professor: Hoi- Chung Leung

Document Summary

Psy 250 biopsych | class notes 3. Inside of neuron more negative than outside; organic negative molecule. Lots of na+ and cl- ions outside. Leakage of na+ ions and k+ in and out of the neuron respectively. Sodium-potassium pump corrects the leakage of ions in and out: sodium-potassium pumps is not the main reason that things are at equilibrium. Main reason that everything is at equilibrium is because of cell membrane"s semi-permeability. Uneven distribution of ions and negative organic molecule makes the inside negative. Resting potential remains stable until neuron is disturbed or stimulated: generation of psp (postsynaptic potential and ap if stimulation is strong enough. Transmitted decrementally: because it is passive, it will gradually decreases as it transmits away from point of origin, closer to axon hillock likelier chance of having a stronger effect. Can be excitatory/inhibitory: excitatory postsynaptic potential (epsp) depolarization. Related to ligand gated sodium ion channels to allowing sodium ions in: inhibitory postsynaptic potential (ipsp) hyperpolarization.