Resting potential

• What is the main topic of the video?

  Neurons and resting potential
• What are the main parts of a myelinated motor neuron?

  • Cell body
  • Dendrites
  • Axon
  • Myelin sheath (Schwann cells)
• What is the function of the cell body in a neuron?

  Contains organelles for protein and neurotransmitter production
• What do dendrites do in a neuron?

  Carry action potentials to surrounding cells
• What is the role of the axon in a neuron?

  Conducts nerve impulses along its length
• What is the myelin sheath made of?

  Layers of lipid from Schwann cells
• What is the function of the myelin sheath?

  Acts as an insulator for the axon
• What are the gaps in the myelin sheath called?

  Nodes of Ranvier
• What happens at the nodes of Ranvier?

  Action potentials can be generated
• What is resting potential in a neuron?

  Difference in electrical charge when inactive
• What is the resting potential value in millivolts?

  -70 millivolts
• Why is the resting potential negative?

  More positive ions outside than inside
• What maintains the resting potential of -70 millivolts?

  Sodium-potassium pump in the axon membrane
• How does the sodium-potassium pump function?

  Transports 3 sodium out and 2 potassium in
• What does the electrochemical gradient refer to?

  Buildup of sodium outside and potassium inside
• What is facilitated diffusion in the context of resting potential?

  Movement of ions across the membrane via channels
• Why is the cell membrane more permeable to potassium ions?

  More potassium channels than sodium channels
• What happens to potassium ion channels compared to sodium ion channels?

  Potassium channels are mainly open, sodium are not
• What is the significance of maintaining -70 millivolts?

  It is the resting potential of the neuron
• What are the key features of resting potential maintenance?

  • Sodium-potassium pump
  • Electrochemical gradient
  • Facilitated diffusion of ions
  • More potassium channels than sodium channels
• Where can students find more questions related to the topic?

  Miss Esther's website
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