PSYB65H3 Lecture Notes - Lecture 6: Reuptake, Neuroglia, Resting Potential
Document Summary
Week 7 lecture #6: wednesday october 21, 2015. Base line is not 0, but -70: hyperpolarization. Increase in electrical charge across a membrane (more negative) Usually due to the inward flow of chloride ions or outward flow of potassium ions. Becomes more negative, b/c chloride is negative and they"re coming in: depolarization. Decrease in electrical charge across a membrane (more positive) Usually due to the inward flow of sodium. Sodium positive and moving inward, so shifts to 0/ pass 0. Large, brief reversal in polarity of an axon. Goes down axon and reaches its target (the synapse: threshold potential. The magic number the axon has to become for the action potential to be triggered. Voltage gated membrane only responds to a certain voltage. Voltage on a neural membrane at which an action potential is triggered. Opening of na+ and k+ voltage-sensitive channels. Approximately 40 mv relative to extracellular surround. *** this figure will be on mt #2****
