The Heartbeat

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