Textbook Notes (368,774)
Canada (162,158)
Psychology (1,899)
PSY100Y5 (809)
Dax Urbszat (681)
Chapter 3

textbook notes Chapter3

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Department
Psychology
Course
PSY100Y5
Professor
Dax Urbszat
Semester
Fall

Description
Oct62003 CHANAPS Notes From Reading C HAPTER3: THE B IOLOGICALBASIS OFB EHAVIOR Chapter 3 (The biological Bases of Behavior) Communication In The Nervous System Nervous Tissue: The Basic Hardware Glia- cells found throughout the nervous system that provide structural support, nourishment, and insulation for neurons. Neurons- individual cells in the nervous system that receive, integrate, and transmit information Somacell 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- Long, thin 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. (speeds up the transmission of signals that move along axons) Synapse- junction where information is transmitted from one neuron to another The Neuron at Rest: A Tiny Battery - Neural impulse is a complex electrochemical reaction. - Both inside and outside the neuron are fluids containing electrically charged atoms and molecules called ions. - Neuron is a tiny battery, a store of potential energy The Action Potential - if voltage of neuron remains constant, the cell is quiet and no messages are being sent - Action potential- very brief shift in a neurons electrical charge that travels along an axon. Absolute refractory period- minimum length of time after an action potential during which another action potential cannot begin. The All or None Law - weaker stimuli do not produce smaller action potentials Sending Signals: Chemicals as Couriers 19 www.notesolution.com
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