Muscles and Hearts
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Questions and Answers

Which of the following correctly sequences the events of muscle contraction?

  • Action potential travels down the T-tubules, calcium ions are released from the sarcoplasmic reticulum, myosin heads bind to actin filaments, cross-bridges form and the sarcomere shortens (correct)
  • Action potential travels down the T-tubules, myosin heads bind to actin filaments, calcium ions are released from the sarcoplasmic reticulum, cross-bridges form and the sarcomere shortens
  • Myosin heads bind to actin filaments, calcium ions are released from the sarcoplasmic reticulum, cross-bridges form and the sarcomere shortens, action potential travels down the T-tubules
  • Calcium ions are released from the sarcoplasmic reticulum, myosin heads bind to actin filaments, action potential travels down the T-tubules, cross-bridges form and the sarcomere shortens

    • What is the order of the cardiac conduction system?

  • SA Node, Bundle of His, AV Node, Purkinje fibers
  • AV Node, Bundle of His, SA Node, Purkinje fibers
  • SA Node, AV Node, Bundle of His, Purkinje fibers (correct)
  • AV Node, SA Node, Purkinje fibers, Bundle of His

    • What causes the 'dup' sound of the heart?

  • Closure of the semilunar valves (correct)
  • Opening of the semilunar valves
  • Opening of the atrioventricular valves
  • Closure of the atrioventricular valves

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