Circulatory and Respiratory System Crossword

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Across
  1. 3. controls inspiration and expiration of air a prevents inhalation of foreign objects
  2. 7. grooves holding arteries and veins in the heart
  3. 9. system in which main functions are to bring in oxygen and rid the body of waste in the form of carbon dioxide
  4. 11. letting air out of the lungs
  5. 12. protein that destroys bacteria, viruses, and other substances that invade the body.
  6. 13. microscopic blood vessels with a wall formed of one layer of simple squamous cells
Down
  1. 1. system which transports oxygen hormones and nutrients to body tissues and carbon dioxide waste from the body tissues and controls body temperature
  2. 2. bringing air into the lungs
  3. 4. carry blood away from the heart
  4. 5. four-chambered, hollow muscle used to pump blood
  5. 6. liquid substance in which various solid materials are suspended and moved about
  6. 8. vessels which carry blood away from the heart to the body tissues
  7. 10. vessels which carry blood toward the heart