PSYCH 101 Chapter Notes - Chapter 5: Facial Tissue, Myelin, Neuroglia
13 Mar 2017
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Biological perspective: concerned with the link between biology and behavior. Dendrites: a neurons branchy extension that receive messages and conduct impulses towards the cell body. Axon: the neuron extension that passes a message through its branches to other neurons muscles or glands. Axons can be longs - feet throughout the body. Myelin sheath: a fatty tissue covering the axon that enables faster transmission speeds. Laid down by the body until age 25. Degenerates with age creating multiple sclerosis (slow and eventually end of muscles movement/communication) Glial cell (glia): cell in nervous system that support, nourish, and protect neurons. Potentially play a role in learning and memory. Neural impulses even at their fasted is 3 million times slower than electricity through a wire. Action potential: a neural impulse; a brief electrical charge that travels down an axon. Axons are selectively permeable to what action potentials get in. Releases ions and positive energy causes movement.
