psy Chapter 3 notes

psy Chapter 3 notes - Chapter 3 Biological Bases of...

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Chapter 3 Biological Bases of Behavior Communications in the nervous systems Nervous system – living tissue composed of cells --neurons are communication cells -Receive, integrate, transmite info -Mostly with other neurons -Sometimes with muscles n organs --Glia- support cell -b4 thought only function was to provide info for cells  but they provide various support Neurons Soma (cell body) --cell nucleus and chemical machinery Dentrites: receive info Axon: transmits info away from soma Myenlin Sheath: insulating material covering some  axons (fatty substance that speeds signal transmissions)  makes brain a lot more effective in general Terminal buttons secrete neurotransmitters, basically  chemicals used to transmit info Synapse: Space between neurons were info is exchanged Glia --Smaller than neurons but outnumber neurons 10 to 1
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--Account for 50% of brain volume --believe to participate in communications --Supply nourishment, remove waste, provide insulation for  axons --New research: glia may also send and receive chem.  Signals.  The Neural Impulse --Fluids inside and outside neurons contain electrically  charge particles (ions) --Sodium (+), potassium (+), chloride (-) flow back and forth  through cell membrane, but at different rates --Higher concentration of (-) ions insde -resting potential – stable neg charge while neuron is  inactive Stimulation makes cell open up and allow ions, when at  rest negative, when ions flow in become less neg or  possitive The Action Impulse  --Stimulation ->cell membrane opens Briefly -> positively charged sodium ions Flow -> in neuron charge becomes less neg (or even  positive) Action Potential -Shift in electrical charge that travels along the axon
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FROM CLIP: Travels unchanged to terminals, the event 
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