Other questions in this quiz

2. In an ECG recording, the RR interval is 0.5 seconds. What is the heart rate?

  • 50 beats/min
  • 120 beats/min
  • 60 beats/min
  • 30 beats/min

3. The parasympathetic nervous system decreases heart rate by:

  • closing K+ channels and opening funny channels
  • opening K+ channels and closing T-type Ca2+ channels
  • closing T-type Ca2+ channels and closing K+ channels
  • opening T-type Ca2+ channels and opening funny channels

4. After reaching the AV node, the depolarizing current in the heart travels to the:

  • SA node
  • Bundle of His
  • Left and right bundle branches
  • Bundle of His

5. The sympathetic nervous system increases heart rate by:

  • closing K+ channels and opening funny channels
  • opening T-type Ca2+ channels and opening funny channels
  • closing T-type Ca2+ channels and closing K+ channels
  • opening K+ channels and closing funny channels

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