PsychNerves - Psychology 1-28-8 Neuron send signals you...

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Psychology 1-28-8 Neuron - send signals, you need a battery to send a signal; signals within neurons are electrical, signals between neurons tend to be chemical; bathed in a solution a lot like seawater (contains Na+, Cl-, K+) has a bipolar semi- permeable membrane Dendrites Soma Axon Axon Hillock - “toll keeper” Ions- charged compounds Anions- negatively charged Too big to get out semi-permeable membrane, therefore stuck inside neuron Na-K pump located in membrane Resting potential- (-70 millivolts) inside membrane relative to outside Electrostatic Gradient- Na+ flows to Anions within membrane Concentration Gradient - liquid flows from high concentration to low concentration Terminal Button - contain synaptic vesicles Synaptic vesicles contain neurotransmitters Neurotransmitters- chemical keys
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Action potential- graphical representation of a neuron sending a signal Myelin- Saltatory (to dance) Conduction- Action potentials dances down the axon, faster, saves energy Nodes of Ranvier- breaks between myelin sheath Multiple Sclerosis - eats away the myelin, as the insulation gets eaten away it begins to misfire Topical anesthetics work by blocking Na+ pumps Synapse Synaptic cleft Electrical - 20 Angstroms- Gap junctions (any place you have to have fast signals) Chemical - 200 Angstroms Presynaptic Cell Voltage dependent Ca+ channels, when voltage changes they change shape, when they change shape calcium enters the cell Happens when Action Potential reaches terminal button
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This note was uploaded on 04/22/2008 for the course PSYC 1013.0 taught by Professor Wight during the Spring '08 term at Ouachita Baptist.

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PsychNerves - Psychology 1-28-8 Neuron send signals you...

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