el system del circulatory

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Across
  1. 5. - The primary muscle used to breathe
  2. 6. - The tube that food is meant to go down
  3. 8. - The passageway for air from your nose and mouth to your lungs
  4. 10. - The lower areas of the heart are called...
  5. 12. - This is where gas exchange takes place at in the lungs
  6. 13. - The valve that connects the left atrium and ventricle
  7. 16. - The largest blood vessel in the body is the...
  8. 17. - Arteries and veins that carry CO2-rich blood are called...
  9. 18. - Cavities in the face that produce mucus to protect against infection
  10. 19. - The upper areas of the heart are called...
Down
  1. 1. - The main organ of the respiratory system
  2. 2. - Where the vocal cords are
  3. 3. - Tiny blood vessels
  4. 4. - Carries blood to the heart
  5. 7. - Carries blood away from the heart
  6. 9. - the main organ in the circulatory system
  7. 11. - Leaf-shaped structure that closes the glottis
  8. 14. - Keeps food from going down the trachea when eating
  9. 15. - The walls of the heart
  10. 16. - The valve that carries blood to the aorta is called...