The respiratory and cardiovascular systems

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Across
  1. 2. A strong muscle just below the lungs
  2. 4. The blood is made up of both red and _____ blood cells
  3. 8. The voice box
  4. 11. A large blood vessel
  5. 12. An upper chamber of the heart
  6. 13. The organ that supplies blood
  7. 14. Another term for gaseous exchange
  8. 16. Breathing in
  9. 18. The organ we use to breathe
  10. 19. A lower chamber of the heart
Down
  1. 1. The wind pipe
  2. 3. The only veins that carry oxygenated blood
  3. 5. When we breathe out
  4. 6. It divides the heart into two sides
  5. 7. Smaller than bronchi
  6. 9. Tubes at the lower end of the trachea
  7. 10. Small, thin walled blood vessels
  8. 15. The second phase of the heartbeat
  9. 17. The first phase of the heartbeat
  10. 19. The tubes that carry blood back to the heart