Muscle Contraction and the Sliding-Filament Model
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Questions and Answers

What is the key feature of the sliding-filament model that explains muscle contraction?

  • Thick and thin filaments ratchet past each other, powered by myosin molecules (correct)
  • The myosin molecules move along the actin filaments
  • The sarcomere length remains constant during contraction
  • Thick and thin filaments change length during contraction

    • What is the function of the globular 'head' region of the myosin molecule?

  • Binding to actin filaments
  • Binding to other myosin molecules
  • Binding ATP and pulling the thin filament (correct)
  • Converting chemical energy to kinetic energy

    • What is the result of the hydrolysis of bound ATP in the myosin molecule?

  • The myosin molecule converts to a high-energy form (correct)
  • The myosin head binds to actin
  • The myosin molecule releases from the actin filament
  • The myosin head returns to its low-energy form

    • What is the function of the 'tail' region of the myosin molecule?

    <p>Binding to other myosin molecules</p> Signup and view all the answers

    What is required for muscle contraction?

    <p>Repetitive cycles of binding and release</p> Signup and view all the answers

    What happens to the myosin head when a new ATP molecule binds?

    <p>It releases from the actin filament</p> Signup and view all the answers

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