The Heartbeat

12345678
Across
  1. 4. shows stimulation(contraction/depolarization) of the ventricles
  2. 6. basic rhythm and rate of the heartbeat?
  3. 8. What is the prefix of heartbeat? (medical terminology)
Down
  1. 1. Heartbeat rate?
  2. 2. what is the abbreviation of this node?
  3. 3. recovery(relaxation) of the ventricles
  4. 5. due to stimulation(contraction) of the atria
  5. 7. what ventricle pumps blood into the pulmonary artery, then into the lungs?