Muscle Contraction and Relaxation
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Questions and Answers

Which molecule is responsible for the re-sequestration of calcium back into the SR for relaxation to occur?

  • Actin
  • Tropomyosin
  • ATP (correct)
  • Myosin
  • What is the cause of rigor mortis, the muscular rigidity that accompanies death?

  • Tropomyosin recovery
  • Enzymatic degradation
  • High levels of calcium
  • Lack of ATP (correct)
  • In skeletal muscle, which molecule does calcium bind to in order to regulate actin and myosin interaction?

  • Troponin C (correct)
  • Calmodulin
  • Tropomyosin
  • ATP
  • Which molecule is responsible for recovering the binding sites in actin when calcium levels drop?

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

    Which muscle type has calcium binding to calmodulin to regulate actin and/or myosin interaction?

    <p>Smooth muscle</p> Signup and view all the answers

    What happens to actin and myosin when ATP is not available?

    <p>They remain attached</p> Signup and view all the answers

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