PY 101, Week 1 Notes
PY 101, Week 1 Notes Psychology 101
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This 2 page Class Notes was uploaded by Hannah Tomlinson on Tuesday August 30, 2016. The Class Notes belongs to Psychology 101 at University of Alabama - Tuscaloosa taught by Rachel in Fall 2016. Since its upload, it has received 21 views. For similar materials see Intro to Psychology in Psychology at University of Alabama - Tuscaloosa.
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Date Created: 08/30/16
8/22 Neurons and Neurotransmitters Neurons : basic units of the nervous system Operates through electrical impulses Communicate with other neurons through chemical signals Forms neural networks Three basic phases Reception Integration Transmission Three types of neurons Sensory: touch/feel Motor: brain telling neurons to hold it/what it feels like/how much pressure to apply Interneuron: sensory and motor go throughout whole body, interneuron doesn’t Reception Dendrite: branchlike extensions -They get the information and pass it through Integration Cell body (soma): where the information is collected and passed Axon: information is transmitted to other neurons [Action potential happens here] Glial: non-neuronal cells that maintain homeostasis Myelin Sheath: insulates some axons for faster movement along the axon; covers and protects axon Node of Ranvier: small gaps of exposed axon, where action potential takes place; charging station Transmission Terminal buttons: small nodules that release chemical signals from the neuron to synapse [located at the end of an axon] Synapse: space between the terminal button and dendrites of the next neuron Neurotransmitters: chemicals that transmits from one neuron to another Receptor: neurotransmitters bind to these molecules after passing across the synapse Action Potentials Resting membrane potential: electrical charge of a neuron when inactive -Ready for action: negative of inside and positive on outside Action potential (neural firing): electrical signal that passes along the axon and causes release of chemicals from terminal buttons Neurotransmitters receive chemical signals from nearby neurons at the dendrites -Excitatory signals depolarize (i.e. increases chance of neural firing) -Inhibitory signals hyperpolarize (i.e. decreases chance of neural firing) -Has to have more excitatory signals to go to the cell body Sodium potassium pump is how messages travel through the axon
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