In this video, we will explain in detail the different phases of the Action Potential: Resting, Depolarization, Repolarization, and Hyperpolarization. We will also explain how the action potential is propagated along the axon. Prof. Dr. Victor Proença – IBAP Courses See below some of the contents of this video: • Electrical Membrane Potential • Cells have differences in electrical potential (inside/outside) = Membrane Potential • Excitable cells generate electrochemical impulses in their membranes • Transmit signals along the membrane • Concentration of sodium and potassium ions in the intracellular and extracellular environment during the resting potential • Why is the inside of the cell negative? • Why is there more sodium outside the cell than inside? • Why is there more potassium inside the cell than outside • How do ions enter and leave the cell during the resting potential? • What is the role of the Sodium-Potassium Pump in cell polarization • How does the Na+-K+ pump work? • Active transport (ATP) • 3 units of Na+ out/2 units of K+ in • Creates electrochemical gradient • Characteristics and Phases of the Action Potential • How is the cell polarity during Rest? • What is Depolarization (Na+ entry)? • What is the most important ion during depolarization? • How and why does sodium enter the cell during depolarization? • What is Repolarization (K+ exit)? • What is the most important ion for repolarization to occur? • How and why does potassium leave the cell during repolarization? • What is Hyperpolarization? • Action potential step by step • What are the states of voltage-gated sodium ion channels • What are the states of voltage-gated potassium ion channels • How does the electrical propagation of the Action Potential occur • What is a nerve impulse? I hope this video can help a lot in your career. Write in the comments what you thought of this content. Also remember to like the video, subscribe to the channel and activate notifications to receive the next content on Physiology and other important subjects for the health professional. Big hug, Prof. Dr. Victor Proença @IBAPCursos ***** Playlist with other Physiology classes: • Neuron Action Potential Phases... Below are some videos that you will also like: • Composition and Function of Blood Blood Tissue Cells Red Blood Cells Leukocytes: • Composition and Function of Blood Tissue... • Cell Organelles and Their Functions Parts of Cells Cell Structure and Physiology: • Cell Organelles and Their Functions ... • Causes of Cell Injury Types Mechanisms Reversible and Irreversible Adaptation Pathology: • Causes of Cell Injury Types Mechanisms... • Physiology of Skeletal Muscle Contraction: How It Occurs Step by Step Actin and Myosin: • Physiology of Skeletal Muscle Contraction... • Neuron Action Potential Phases of the Action Potential Resting Membrane Potential: • Neuron Action Potential Phases... • Introduction to Human Physiology Positive and Negative Feedback Homeostasis: • Introduction to Human Physiology Feed... • Depolarization, Repolarization and Hyperpolarization Phases of the Action Potential #Physiology • Depolarization, Repolarization and Hyperpolar...