Lecture 6 PSYCH 254
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This 2 page Class Notes was uploaded by Brianna Nelson on Tuesday February 16, 2016. The Class Notes belongs to PSYCH 254 at University of Wisconsin - Milwaukee taught by James Moyer in Spring 2016. Since its upload, it has received 20 views. For similar materials see Physiological Psychology in Psychlogy at University of Wisconsin - Milwaukee.
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Date Created: 02/16/16
Lecture 6 How do neurons communicate? 1. Chemical Transmission 2. Electrical Transmission Chemical Transmission Synapses: junction between two neurons composed of three parts: presynaptic, synaptic cleft, postsynaptic Types of Synapses in NS: axodendritic, axosomatic, axoaxonic, neuromuscular junction Electrical Transmission Gap Junctions- communication with glial cells and neurons; electrical coupling Depolarization/hyperpolarization Action potential Resting Membrane Potential (RMP) 1. Neurons bathed in salt 2. Ions-positive (cations) 3. -negative (anions) 4. Cell membrane restricts ion movement 5. RMP allows neurons to be electrically excitable 6. -70mV, inside more negative than outside 7. Important ions: Na+, Cl-, Ca2+: more outside; K+: more inside 8. Action potential occurs in axon(threshold/all or none) Action Potential Small inputs If input large enough, threshold is reached At threshold, an action potential is initiated Signal Integration Temporal/ spatial summation EPSP: excitatory postsynaptic potential: creates depolarization IPSP: inhibitory postsynaptic potential: creates hyperpolarization
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