Muscle Contraction and Calcium Signaling Pathway Quiz
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Questions and Answers

Where do Ca ions bind to initiate contraction in cardiac muscle?

  • Sarcoplasmic reticulum
  • Ryanodine receptor-channels
  • Troponin (correct)
  • Voltage-gated Ca2+ channels
  • What is the primary function of the NCX antiporter in cardiac muscle?

  • Pumping Ca back into the sarcoplasmic reticulum
  • Initiating contraction by binding to troponin
  • Inducing Ca release through ryanodine receptor-channels
  • Exchanging Ca with Na+ (correct)
  • What causes the release of Ca sparks in cardiac muscle?

  • Activation of the Na+-K+-ATPase
  • Pumping Ca back into the sarcoplasmic reticulum
  • Voltage-gated Ca2+ channels opening in the T-tubule
  • Induction of Ca release through ryanodine receptor-channels (correct)
  • What happens during relaxation of cardiac muscle?

    <p>Ca ions unbind from troponin</p> Signup and view all the answers

    What is the main difference between cardiac muscle action potentials and action potentials in neural and skeletal muscle cells?

    <p>Cardiac action potentials have a higher permeability to ion X.</p> Signup and view all the answers

    What happens during the phase labeled as '3' in the myocardial contractile cell action potential?

    <p>Ca2+ channels open; fast K+ channels close</p> Signup and view all the answers

    Why are cardiac action potentials unique compared to other cell types?

    <p>They have a longer duration than action potentials in other cell types.</p> Signup and view all the answers

    What happens during the refractory period in cardiac muscle?

    <p>Ion channels are inactivated, preventing further depolarization.</p> Signup and view all the answers

    What is the role of Na+ channels in the propagation of action potentials through the heart tissue?

    <p>They generate local depolarization and activate adjacent Na+ channels.</p> Signup and view all the answers

    What is the function of Ca2+ channels during the myocardial contractile cell action potential?

    <p>They close slowly while K+ channels open.</p> Signup and view all the answers

    Which factor is used to infuse Dilan each week to manage his hemophilia A?

    <p>Factor VIII</p> Signup and view all the answers

    What is the primary cause of Jason's stroke?

    <p>A blood clot</p> Signup and view all the answers

    Which of the following is NOT a factor that prolongs vasoconstriction during the vascular phase of hemostasis?

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

    What factor is made by endothelial cells and platelets, and binds to both collagen and platelets during the platelet phase of hemostasis?

    <p>von Willebrand factor</p> Signup and view all the answers

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