Cell Membrane Potentials | Conduction of Action Potential: Neuron скачать в хорошем качестве

Cell Membrane Potentials | Conduction of Action Potential: Neuron

Dive into the fascinating world of cell membrane potentials with this video! 🌊 A cell membrane is a fluid structure that surrounds intracellular components, and it's polarized with positive and negative charges due to ions and other particles inside and outside the cell. The charged nature of the cell membrane is crucial for transport mechanisms. Let's explore the basics of electrophysiology! ⚡️ ▬ 📃 Electrophysiology To understand cell membrane potential, brush up on some basic physiology concepts: 👉 Ion Concentration The difference in ion distribution makes the cell membrane polarized. Sodium and chloride ions dominate the extracellular fluid, while potassium ions and negatively charged molecules dominate the intracellular fluid. 👉 Charge Distribution Ions are charged particles. At rest, more positively charged ions are outside the cell than inside. 👉 Electrical Potential Separated by the plasma membrane, charged particles have opposite polarity and the potential to do work. This is called electrical potential. 🌟 👉 Biological Electricity Our bodies generate electrical currents and potentials, essential for life processes like neuronal signaling, heart muscle contractions, muscle movement, and glucose transport. ❤️ ▬ 📜 Resting Membrane Potential Established due to differences in ion concentration and permeability across the cell membrane. ▬ 📃 Concentration & Electrical Gradient The concentration gradient drives ions in and out of the cell. The electrical gradient creates a charge difference across the membrane, known as the electrochemical gradient. ▬ 📜 Nernst Equation Used to calculate the potential of each ion. For sodium, it's 61.5 times the log of the ion concentration outside divided by inside the cell. ▬ 📃 Action Potential A local change in voltage initiated by neurotransmitters. Ions flow, generating an action potential with five phases: 📍Resting membrane potential 📍Threshold: The necessary intensity for action potential propagation. 📍Rising phase (depolarization): Sodium influx makes the cell positively charged. 📍Falling phase (repolarization): Sodium channels close, potassium channels open, restoring polarity. 📍Recovery phase: Returns to resting potential after hyperpolarization. Action potentials travel over the entire surface of excitable cells, an all-or-nothing phenomenon. 🚀 ▬ 📜 Conduction of Action Potential Essential for life processes, differing in neurons and heart muscles due to structural makeup. ▬ 📃 Neuron Initiated when dendrites receive a signal, conducting it through voltage-gated ion channels. The resting potential is roughly -70 mV, and action potential is triggered at about -55 mV. ▬ 📜 Heart Action potentials by pacemaker cells and contractile myocytes. The SA node is the heart's main pacemaker, creating action potentials that travel through atria myocytes via gap junctions, electrically coupling nearby cells. For a detailed understanding, watch the video! 🎥 ▬ 🎬 5500+ sqadia.com Medical Videos ▬▬▬▬▬▬▬▬▬▬ 👩🏻‍⚕️ Accessible Medical Student Education 24/7/365 💡 Simplifying Medical Learning 💪 Study Hard, Dream Big, Achieve More #CellMembranePotentials #Electrophysiology #RestingMembranePotential #ActionPotential #Biology #Physiology #Neurons #Heart #Science