How Neurons Generate Electrical Signals (Ch12 Part 2)

Welcome back to Chapter 12! In this lecture, we explore how neurons generate and transmit electrical signals called action potentials. Topics Covered Neural Communication Why neurons use electrical signals Long-distance communication in the nervous system Action potentials Resting Membrane Potential Resting state of neurons Negative intracellular charge Membrane polarization The Sodium-Potassium Pump ATP-powered transport Sodium (Na⁺) Potassium (K⁺) Establishing resting membrane potential Threshold Subthreshold stimuli Threshold stimuli All-or-none principle Action Potential Stages Depolarization Repolarization Hyperpolarization Return to resting state Ion Channels Sodium channels Potassium channels Ion movement across the membrane Propagation of Action Potentials Signal transmission along the axon Chain reaction of membrane depolarization Long-distance neural communication Modeling Action Potentials Following ion movement Understanding membrane charge changes Predicting action potential behavior By the end of this lecture, you'll be able to describe how neurons generate electrical signals, explain the roles of sodium and potassium, and trace the complete sequence of an action potential.