Electrical Activity of the Heart
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Questions and Answers

Which of the following is NOT a factor that determines the resting membrane potential of cardiac myocytes?

  • The presence of voltage-gated ion channels (correct)
  • The concentration gradient of positively and negatively charged ions across the cell membrane
  • The relative conductance of the cell membrane to these ions
  • The activity of the Na+-K+ ATPase pump

    • What is the primary factor that contributes to the resting membrane potential of -90 mV in cardiac myocytes?

  • The activity of the Ca2+-ATPase pump
  • The efflux of Na+ ions along their concentration gradient
  • The efflux of K+ ions along their concentration gradient (correct)
  • The influx of K+ ions along their concentration gradient

    • What is the equilibrium potential for Na+ in cardiac myocytes?

  • -90 mV
  • +61 mV (correct)
  • -94 mV
  • +94 mV

    • How does the Na+-K+ ATPase pump contribute to the resting membrane potential in cardiac myocytes?

    <p>It pumps 3 Na+ out and 2 K+ in, making the inside more negative</p> Signup and view all the answers

    What is the primary reason for the continuous leak of K+ from inside to outside the cardiac myocytes at the resting membrane potential of -90 mV?

    <p>The equilibrium potential for K+ is more negative than the resting potential</p> Signup and view all the answers

    Which of the following ions contributes the least to the resting membrane potential of cardiac myocytes?

    <p>Na+</p> Signup and view all the answers

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