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Psychology (2,948)
PSY100H1 (1,804)
Chapter 3

Summary of Chapter 3

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University of Toronto St. George
Michael Inzlicht

Chapter Three The biological bases of behavior Communication in the nervous system Key parts of the neuron - Cells in the nervous system fall into two categories: 1) Neurons - Neurons: individual cells in the nervous system that receive, integrate, and transmit information. - Soma (=cell body): contains the cell nucleus and much of the chemical machinery common to most cells. - Dendrites: parts of a neuron that are specialized to receive information. - Axon: a long, think fiber that transmits signals away from the soma to other neurons or to muscles or glands. - Myelin sheath: insulating material, derived from glial cells, that encases some axons. - Terminal buttons: small knobs that secrete chemicals called neurotransmitters. - Synapse: junction where information is transmitted from one www.notesolution.com neuron to another. 2) Glia - Glia: cells found throughout the nervous system that provide various types of support for neurons. - Supply nourishment to neurons, help remove neurons waste products, and provide insulation around many axons. The Neural impulse - The resting potential: when a neuron is stable, negative charge when the cell is inactive. - Action potential: a very brief shift in a neuron electrical charge that travels along an axon. - Absolute refractory period: the minimum length of time after an action potential during which another action potential cannot begin. - Either neuron fires or it doesnt, and its action potential are all the same size. Weaker stimuli do not produce smaller AP. The synapse where neurons meet www.notesolution.com
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