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PY 101, Week 1 Notes

by: Hannah Tomlinson

PY 101, Week 1 Notes Psychology 101

Hannah Tomlinson

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About this Document

Neurons and Neurotransmitters
Intro to Psychology
Class Notes
25 ?




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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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