PSYC 2390 Lecture Notes - Lecture 2: Diazepam, Absolute Threshold, Barbiturate

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2390
• Professor: Lana Trick

Document Summary

Ions particles with electrical charge, if have a negative charge = took an electron from someone, a positive charge = lost an electron. Resting potential what the neuron is at when it is not stimulated (-70), very negative because of lots of negative aminoacids on the inside and not so many positive k ions. Squished/stimulated membrane changes it"s permeability (selectively permeable: 1. Lets na+ in (for 1/2 ms) makes the membrane potential more positive due to inlux of na+ to +40: 2. K+ ions are pushed out by na+ - makes the membrane potential more negative, lower than resting potential. After na+ comes in, k+ is booted out. Changes the membrane potential from ++ to . All or none you either reach action potential and complete the impulse, or you don"t, there"s no half. Limited to 500 action potentials a second an upper limit to how many you can have.