Psychology 1000 Chapter Notes - Chapter 3: Multiple Sclerosis, Reuptake, Master Control

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: John Campbell

Document Summary

In combination, the smaller gaps and glial cells keep foreign substances from gaining access to the brain. In the salty fluid outside the neuron, there are na+ ions and cl- ions. In an instant, the interior now becomes positive in relation to the outside, creating the action potential. In a reflex action to restore the resting state, the cell closes its na+ channels, and. The myelin sheath: fatty, whitish insulation layer derived from glial cells during development. Interrupted at regular intervals by the nodes of ranvier, where the myelin is either extremely thin or absent. In unmyelinated axons, the action potential travels down the axon like a burning fuse. Chapter 3 notes: these receptor sites have a specially shaped surface that fits a specific transmitter molecule, once the neurotransmitter has bound to a receptor site it can have an effect. Specialized transmitter systems: two widespread neurotransmitters are glutamate/glutamic acid and gamma- aminobutyric acid/gaba.