Mastering Calcium Regulation in Smooth Muscle Cells
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Questions and Answers

Which process releases Ca2+ from the SR in smooth muscle?

  • Exchangers
  • Calcium-Induced Calcium-Release (CICR) (correct)
  • Ca2+ channels
  • Ca2+ ATPase pumps

    • How is relaxation of smooth muscle achieved after contraction?

  • By contracting the SR
  • By opening specific Ca2+ channels
  • By removing Ca2+ from the sarcoplasm (correct)
  • By activating Ca2+ ATPase pumps

    • What is the role of Ca2+ pumps & exchangers in smooth muscle?

  • To remove Ca2+ from the sarcoplasm (correct)
  • To release Ca2+ from the SR
  • To contract the smooth muscle
  • To open specific Ca2+ channels

    • Which types of channels allow calcium to enter the smooth muscle cell?

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

    Which processes increase cytoplasmic calcium and promote contraction?

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

    Which molecule stimulates calcium release from the sarcoplasmic reticulum?

    <p>Inositol 1,4,5-trisphosphate (IP3)</p> Signup and view all the answers

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