PSY100H1 Chapter Notes - Chapter 3: Neurotransmitter Receptor, Myelin, Karl Lashley
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PSY100H1 Full Course Notes
Verified Note
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Document Summary
3 types: sensory (afferent), motor (efferent), interneurons (outnumber motor and sensory- facilitate transmission of info within cns) Resting membrane potential: when neuron is at rest, inside is slightly more (-) than outside: ap travels along axon in a wave= propagation polarization creates electrical e needed to fire neuron, myelin- fatty insulation that surrounds cell axon. Increases speed of neural impulses by preventing interference from adjacent cells: deterioration of myelin sheath leads to ms, slows down neural impulses movement, sensation, coordination become impaired, myelin , axons exposed and eventually break down. 3 major events that terminate nt"s influence in synaptic cleft: reuptake: nt taken back into presynaptic terminal buttons, enzyme deactivation: enzyme destroys nt in synaptic cleft, autoreception: nt binds with receptors on presynaptic neuron. When excess is detected, autoreceptors signal to stop releasing nt: same nt can send excitatory or inhibitory postsynaptic signals, depending on receptor"s properties.
