cardiovascular system

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Across
  1. 2. gas inhaled for respiration
  2. 4. contraction phase of the heartbeat
  3. 7. smallest type of blood vessel
  4. 8. upper chamber of the heart
  5. 11. inner lining of the heart
  6. 12. local widening of an arterial wall
  7. 13. rapid but regular contractions
  8. 15. peacemaker of the heart
  9. 16. instrument to measure blood presure
  10. 17. irregular contractions of the heart
Down
  1. 1. high blood pressure
  2. 3. largest vein in the body
  3. 5. heartbeat felt by the walls of the arteries
  4. 6. largest artery in the body
  5. 9. muscular middle layer of the heart
  6. 10. abnormal swishing sound
  7. 14. one of two lower chambers of the heart