Module 3 - Module 3: Neuroscience and Behavior Neural and...

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Module 3: Neuroscience and Behavior I. Neural and Hormonal Systems a. composed of subsystems that are in turn composed of even smaller subsystems b. tiny cells organize to form organs that form larger systems for digestion, c. systems make us bio-psycho-social systems d. by studying links between biological activity & psychological events, biological psychologists are gaining better understanding of sleep & dreams, depression & I A. body’s neural information is complexity built from simplicity 1 building blocks = neurons, or nerve cells a b busy dendrite fibers receive information, & axon fibers pass it along to c other neurons or to muscles or glands d axons = very long e layer of fatty tissue myelin sheath insulates axons of some neurons & helps speed impulses importance is evident in multiple sclerosis disease in which sheath degenerates f neural impulse travels at speeds ranging 2 mph to 200 mph still 3 million times slower than that of electricity through wire measured in milliseconds g neuron fires impulse when it receives signals from sense receptors stimulated by pressure, heat, or light, or when stimulated by chemical messages from neighboring neurons h impulse = action potential brief electrical charge that travels down axon i neurons generate electricity from chemical events chem. to electricity process involved exchange of electrically charged atoms called ions j fluid interior of resting axon has excess of negatively charged ions, while fluid outside axon membrane has more positively charged ions k positive-outside/negative-inside state = resting potential axon’s surface is selective about what it allows in selectively permeable l neuron fires security parameters change first bit of axon opens gates & positively charged sodium ions flood through membrane channel depolarizes m resting pause = refractory period
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This note was uploaded on 02/14/2008 for the course PSYCH 101 taught by Professor Barbagallo during the Fall '07 term at Montclair.

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Module 3 - Module 3: Neuroscience and Behavior Neural and...

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