PSYA01H3 Chapter Notes - Chapter 4: Opiate, Autonomic Nervous System, Perceptual Learning
Document Summary
However the parasympathetic nervous system is a state of calm and digestion usually when someone is relaxed. Lets start off with a picture: neurons or nerve cels are the elements of the nervous system that bring sensory in- formation to and from the brain. Glia cells from the greek word glue keep nerves cells together and not only that, they guide a nerve cell from its place of birth to its final resting place. They also protect nerves by forming a myelin sheath around each nerve fibre. The excitable axon: the action potential: helmholtz discovered that the axon transmission is slower than 30m/s however the outside of an axon is electrically charged. When the axon is at rest the charge is -70mv however the action potential which is very short lived reversal of the electrical charge to. Ions enter the cell through ion channels made up of submicroscopic proteins known as the na+ k pump, heres how it goes: