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This lesson zooms all the way into the microscopic machinery of the nervous system, exploring the two fundamental cell types — neurons and glial cells — and how they work together to power every thought, feeling, and action. From the anatomy of a single neuron to the chemical handoff across the synaptic cleft, Section 3.2 of OpenStax Psychology 2e lays out the biological hardware behind human psychology. The lesson also connects these cellular mechanics directly to real disorders and the drugs designed to treat them. In this video: • Neurons vs. glial cells: their distinct roles and the surprising 1-to-1 ratio revealed by Suzanna Herculano-Houzel's research • Neuron anatomy step by step: dendrites, soma, axon, myelin sheath, nodes of Ranvier, and terminal buttons • How the myelin sheath insulates signals — and what happens when it breaks down in multiple sclerosis • Resting potential and the action potential: how sodium and potassium ions create and fire the 'all-or-none' electrical spark • Synaptic transmission: how electrical signals convert to chemical messages via neurotransmitters and the lock-and-key receptor system • Reuptake and why the chemical synapse gives the brain flexibility, volume control, and the capacity for learning • Agonists, antagonists, and reuptake inhibitors (SSRIs): how psychotropic drugs target neurotransmitter systems in conditions like Parkinson's, schizophrenia, and depression #OpenStax #Psychology #Neuroscience #Neurons #BrainScience OpenStax Content adapted from "OpenStax Psychology 2e", by OpenStax licensed under CC BY 4.0. Content based on Web Version: Apr 23, 2026. Read the textbook online https://openstax.org/details/books/psychology-2e Music first girl talking to me. by ikkun (ex. Barradeen) | https://soundcloud.com/ikkunwastaken Royalty Free Music by https://www.free-stock-music.com Creative Commons / Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en_US
Answer each question based on what was presented in the video lesson. No outside knowledge is needed — all answers can be found in the video.
Answer each question based on what was covered in the video lesson. Show your reasoning where asked, and pay close attention to the sequence of events in neural firing and synaptic communication.
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