Nerve cells and Electrical signalling
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Questions and Answers

Which division of the nervous system communicates to smooth muscle, cardiac muscle, glands, and adipose tissue?

  • Sympathetic nervous system (correct)
  • Parasympathetic nervous system
  • Somatic nervous system
  • Afferent division

    • What are the two main branches of the efferent division of the nervous system?

  • Somatic and parasympathetic nervous systems
  • Sympathetic and somatic nervous systems
  • Afferent and somatic nervous systems
  • Sympathetic and parasympathetic nervous systems (correct)

    • Which type of glial cells function in forming myelin around axons in the central nervous system?

  • Schwann cells
  • Oligodendrocytes (correct)
  • Afferent neurons
  • Interneurons

    • What is the main factor responsible for maintaining the resting membrane potential in cells?

    <p>Sodium-potassium pump</p> Signup and view all the answers

    Depolarization of a neuron to threshold stimulates

    <p>Opening of sodium channels.</p> Signup and view all the answers

    Which of the following glial cells are present in the peripheral nervous system?

    <p>Schwann cells</p> Signup and view all the answers

    If a cation is equally distributed across the cell membrane, which of the following statements is false?

    <p>At 270 mV, the electrical force on the ion acts to move it into the cell.</p> Signup and view all the answers

    The depolarization phase of an action potential is caused by

    <p>Opening of sodium channels.</p> Signup and view all the answers

    What is the function of the Na+>K+ pump in a neuron?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of the Na+>K+ pump in preventing changes in concentration gradients?

    <p>To transport more sodium and potassium ions to compensate for the greater movement of these ions through opened voltage-gated channels</p> Signup and view all the answers

    What is the effect of fiber diameter and myelination on the conduction velocity of action potentials?

    <p>Both fiber diameter and myelination increase the conduction velocity of action potentials</p> Signup and view all the answers

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