Heart and Lungs

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Across
  1. 4. the pulsation of the heart
  2. 6. a hollow part of cavity in a organ
  3. 7. the action of breathing
  4. 12. any of the many tiny air sacs in the lungs
  5. 13. 2 cusps or points
  6. 14. any of the muscular walled tubes forming part of the circulation system by blood
  7. 15. the process of taking air in and expelling it from the lungs
  8. 16. the invisible gaseous substance surrounding the earth
  9. 17. a large vein carrying deoxygenated blood into the heart
Down
  1. 1. any of the minute branches into which a bronchus divides
  2. 2. the main artery of the body
  3. 3. a large membranous tube reinforced by rings of cartilage
  4. 5. any of the major air passages of the lungs that diverge form the windpipe
  5. 8. a rhythmical throbbing of he arteries as blood is propelled through them
  6. 9. 3 cusps or points
  7. 10. a dome shape muscular partition separating the thorax from the abdomen, mammals
  8. 11. a flap of cartilage at the root of the tongue
  9. 18. each of the 2 upper cavities of the heart from which blood is passed to the ventricles