Electrical Activity of the Heart

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Across
  1. 7. site of depolarization delay in the heart
  2. 8. QRS complex is followed by ventricular _______
  3. 9. ions that create the long plateau in cardiac action potentials
  4. 10. ventricular depolarization begins at____
Down
  1. 1. Cardiac contraction is _______ than skeletal
  2. 2. Pacemaker of the heart
  3. 3. Longer cardiac refractory periods prevent
  4. 4. These chambers of the heart contract first
  5. 5. Unlike skeletal muscles, cardiac cells don't have ___ potential
  6. 6. Segment of ECG that corresponds to ventricular depolarization