Action potential of heart MCQ 6+

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• Plateau in the cardiac muscle
  ক

  Is due to opening of slow calcium-sodium channel

  খ

  Results in prolonged refractory period

  গ

  Coincides with ventricular systole

  ঘ

  Is due to K+ efflux

  ঙ

  Is due to opening of transient calcium channel
• Plateau (phase2) of the action potential in cardiac muscle
  ক

  Coincides with ventricular systole

  খ

  Results in prolonged refractory period

  গ

  Is due increased calcium ion influx

  ঘ

  Coincides with PR interval of ECG

  ঙ

  Is due to efflux of K+
• Plateau phase in the action potential of cardiac muscle
  ক

  Is due to slow Ca+ -Na channel

  খ

  Coincides with ventricular systole

  গ

  Results in prolonged refractory period

  ঘ

  Is due to efflux of K+

  ঙ

  Is due to fast sodium channel
• Absolute refractory period in the ventricles
  ক

  Corresponds to the period of ventricular depolarization.

  খ

  Corresponds to the period of ventricular contraction.

  গ

  Is the period when the ventricles are completely unexcitable.

  ঘ

  Is shorter than the corresponding atrial muscle.

  ঙ

  Decrease during stimulation of the vagus nerve to the heart.
• Refractory period in the ventricles
  ক

  Decreases during sympathetic stimulation of the heart

  খ

  Corresponds to the period of ventricular contraction

  গ

  Corresponds to the QRS complex of ECG

  ঘ

  Corresponds to the period of ventricular action potential

  ঙ

  Is shorter than the skeletal muscle
• Refractory period in the ventricles corresponds to the
  ক

  Period of ventricular contraction

  খ

  Period of ventricular action potential

  গ

  QRS complex of ECG

  ঘ

  PR interval of ECG

  ঙ

  ST segment of ECG