Psychology 1000 Lecture Notes - Lecture 1: Drug Resistance, Multiple Sclerosis, Myelin

• School: UofL
• Department: Psychology
• Course: Psychology 1000
• Professor: Petrusvander Velde

Document Summary

Nervous system has two kinds of cells: neurons, glia. The neuron (brain has 100 billion): receives information. Signals are chemical (between neurons) and electrical (within neurons, except for gap junctions, when it"s between neurons) in nature. There are other types but this lecture will focus on those. Terms: afferent = into, efferent = out. (think exit ) A nerve impulse is an electrical message transmitted down the axon of a neuron. The impulse does not travel all the way to the end of the axon, but gets renewed and boosted at the nodes of ranvier. Allows the signal to travel more efficiently (multiple sclerosis involves myelin problems) The sodium-potassium pump is a protein that pumps 3 sodium ions per 2 potassium ions. Positive sodium charges move through the axon (which weaken over time and are renewed at the cell gradient at the nodes of ranvier).