Muscle Contraction Mechanism Quiz
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Questions and Answers

What causes a conformational change in troponin?

  • Ca++ not binding to troponin
  • Movement of the entire troponin-tropomyosin complex (correct)
  • ADP & Pi binding to troponin
  • ATP binding to troponin

    • During crossbridge cycling, what provides energy to 'cock' the myosin head?

  • Tropomyosin exposing the myosin-binding site
  • Reset of the myosin head (correct)
  • Myosin binding to actin
  • Ca++ splitting into ADP & Pi

    • When myosin heads attach to the exposed binding sites on actin, what is the result?

  • Ca++ moves away from the troponin
  • Troponin covers the myosin-binding site
  • ATP binds to the myosin head
  • Tropomyosin is released from the myosin-binding site (correct)

    • What is the result of ADP & Pi release during a power stroke?

    <p>Myosin heads bind to actin</p> Signup and view all the answers

    What is the consequence of Ca++ & ATP absence during cycling?

    <p>Cycling being unable to continue</p> Signup and view all the answers

    What toxin leads to spastic paralysis known as tetanus?

    <p><strong>Botulinum toxin</strong></p> Signup and view all the answers

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