Neurons and the Nervous System
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Questions and Answers

Which structure is considered the basic unit of the nervous system?

  • Cell body
  • Neuron (correct)
  • Axon
  • Synapse
  • What is the function of the cell body in a neuron?

  • Reception of electrical messages (correct)
  • Interpretation of electrical messages
  • Transmission of electrical messages
  • None of the above
  • What is the resting membrane potential of a typical neuron?

  • 0 mV
  • -30 to -50 mV
  • -50 to -70 mV
  • -70 to -90 mV (correct)
  • What is the main cause of the electrical potential difference across the neuron membrane?

    <p>Presence of more negative ions on the inside of the membrane than on the outside</p> Signup and view all the answers

    What happens when a strong stimulus is transmitted along the axon of a neuron?

    <p>It is transmitted to muscles, glands, or other neurons</p> Signup and view all the answers

    Which ions diffuse across the neuron membrane to produce a charge difference and hence a potential difference?

    <p>K+ ions</p> Signup and view all the answers

    What is the range of the electrical potential difference across the neuron membrane?

    <p>-50 to -70 mV</p> Signup and view all the answers

    What is the term used to describe the excess of positive charge in the extracellular region and the excess of negative charge in the cytosol of a neuron?

    <p>Polarization</p> Signup and view all the answers

    What is the net transfer of ions across the neuron membrane driven by?

    <p>Chemical concentration gradient</p> Signup and view all the answers

    What is the function of the electrical force produced by the charge difference across the neuron membrane?

    <p>To repel K+ ions from cytosol to extracellular</p> Signup and view all the answers

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