PSYC 1F90 Study Guide - Final Guide: Positron Emission Tomography, Peripheral Nervous System, Postcentral Gyrus

• School: Brock University
• Department: Psychology
• Course: PSYC 1F90
• Professor: John Mitterer

Document Summary

The affected area can then be lesioned to stop or slow the spread of a disease such as huntington"s disease (patients had to be awake during procedure to observe function) The axon is pierced by tiny tubes called ion channels. The ion channels are normally blocked by molecules acting as gates. During an action potential the gate molecules open and allow sodium ions to rush into the axon (first open at the soma and then proceed to open throughout the axon as the action potential travels through. ) After an action potential is fired in an all-or- nothing event, the cell dips below is resting level in a process known as negative-after-potential. Saltatory conduction: the process by which nerve impulses conducted down axons of neurons coated with myelin (a fatty layer) jump from gap to gap in the myelin layer (helps nerve impulses to move faster)