Psychology 1000 Lecture Notes - Lecture 6: Reflex Arc, Foodborne Illness, Semipermeable Membrane

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

With the different charges, it produces an electrical charge on the cell membrane: negative on inside relative to the outside, neuron is like a tiny battery that is charged from the ions. Neuron just sitting there (no stimulated) it is in resting potential (negative electrical charge -70) If the sodium reaches a certain point (-55)- threshold= the wholes open as wide as they can more sodium floods in and goes to +40. Now the neuron has to recover after +40. We start to repolarize by kicking out the potassium (pump). Potassium goes out and you drop in charge. It does(cid:374)(cid:859)t stop at -70, it overdoes it (drops below resting potential), then you let things float back and it will finally go back to resting potential (-70) Takes about 7millaseconds to get back to resting potential. Absolute refractory period- the time between the peak of +40 and the bottom of hyperpolarization. Nothing can stimulate neuron when it is in the absolute.