PSYCH101 Lecture Notes - Lecture 8: Multiple Sclerosis, Acetylcholine, Peripheral Nervous System

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH101
• Professor: Paul Wehr

Document Summary

Nerve cells (neurons) are the basic unit that make up the nervous system. Nervous system: central nervous system (cns) and the peripheral nervous system (pns) Nerve cells relay information (electrical impulses) throughout the nervous system. Send messages to other neurons, organs, muscles, and glands. Receive messages from other neurons and sensory cells. Glial cells support nerve cells: compose 90% of all cells in nervous system. Dendrites receive information from other neurons or sensory. Axon (specifically the axon terminal)connects neuron to other. Myelin sheath insulates axons and increases conduction rate. Multiple sclerosis: loss of sensation, paralysis, poor neurons further downstream coordination. : electrical charge indicating a neuron has fired . Plasticity: formation and disintegration of synapses throughout the lifespan. Polarization: neuron is negatively charged relative to outside. Cl- & k+ inside neuron; na+ outside neuron. Cell membrane is permeable to k+ na+ channels open during depolarization; na+ pumps operate during repolarization.