The SA Node Mystery
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Questions and Answers

What is the resting membrane potential of the SA node?

  • -60 mV (correct)
  • -10 mV
  • -20 mV
  • -30 mV

    • What causes the SA node to fire spontaneously?

  • Influx of Ca2+ ions
  • Influx of Na+ ions (correct)
  • Influx of Cl- ions
  • Influx of K+ ions

    • What is the threshold potential for firing an action potential in the SA node?

  • +10 mV (correct)
  • -20 mV
  • -30 mV
  • -10 mV

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