Excitation-Contraction Coupling in Muscle Contraction
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Questions and Answers

What triggers the release of Ca2+ from the Sarcoplasmic reticulum (SR)?

  • Diffusion of Na+ into the cell
  • Binding of Ca2+ to troponin
  • Opening of voltage-gated Ca2+ channels on the plasma membrane (correct)
  • Opening of voltage-gated K+ channels

    • What is the role of Ca2+ in muscle contraction?

  • Open voltage-gated K+ channels
  • Bind to troponin to stimulate contraction (correct)
  • Inhibit the binding of troponin to actin
  • Stimulate the contraction of myofibrils

    • What is the primary function of voltage-gated Ca2+ channels on the plasma membrane?

  • Regulate the release of Ca2+ from the Sarcoplasmic reticulum
  • Allow Ca2+ to diffuse into the cell and stimulate the opening of calcium release channels (correct)
  • Stimulate the release of Na+ from the Sarcoplasmic reticulum
  • Inhibit the contraction of myofibrils

    • What is the source of Ca2+ that binds to troponin?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

    What is the direct result of the opening of voltage-gated Ca2+ channels on the plasma membrane?

    <p>Diffusion of Ca2+ into the cell</p> Signup and view all the answers

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