Muscle Contraction and Myosin Structure
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Questions and Answers

What happens to Ca2+ ions after they initiate muscle contraction?

  • They are released into the bloodstream
  • They are pumped back into the SR for storage (correct)
  • They bind to troponin again
  • They bind to actin
  • What type of muscle contraction occurs when a muscle changes its length?

  • Isometric contraction
  • Concentric contraction
  • Isotonic contraction (correct)
  • Eccentric contraction
  • What is the term for the type of muscle contraction where the muscle shortens as it contracts?

  • Isometric contraction
  • Concentric contraction (correct)
  • Eccentric contraction
  • Isotonic contraction
  • What is the opposite type of contraction to concentric contraction?

    <p>Eccentric contraction</p> Signup and view all the answers

    What is the primary function of Ca2+ ions in muscle contraction?

    <p>To initiate muscle contraction</p> Signup and view all the answers

    What type of contraction occurs when a muscle contracts without changing its length?

    <p>Isometric contraction</p> Signup and view all the answers

    What is the result of summated Ca sparks in muscle contraction?

    <p>A single Ca2+ signal</p> Signup and view all the answers

    What happens to the muscle during relaxation?

    <p>Ca2+ unbinds from troponin</p> Signup and view all the answers

    What is the term for the type of contraction that occurs when lifting a weight?

    <p>Concentric contraction</p> Signup and view all the answers

    What is the term for the type of contraction that occurs when lowering a weight?

    <p>Eccentric contraction</p> Signup and view all the answers

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