Upper Respiratory System Crossword

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Across
  1. 3. another name for the throat
  2. 4. the tonsils are part of the ____ respiratory tract
  3. 7. providing an extensive area for gas exchange between air and circulating blood
  4. 9. another name for the voice box
  5. 11. these tubes connect the nasal passage with the middle ear and are part of the upper respiratory system
  6. 12. one function of the respiratory system is to produce ____ involved in speaking, singing, and other forms of communication
  7. 15. the two largest organs of the lower respiratory tract
  8. 16. account for approximately 95% of immune cells in the lungs
  9. 17. the bronchi are part of the ____ respiratory tract
Down
  1. 1. these structures, part of the immune system, are found in the back of the mouth and are part of the upper respiratory system
  2. 2. the flap of cartilage that keeps food from going into the lungs
  3. 3. one of the functions of the respiratory system is ____ respiratory surfaces from dehydration, temperature changes, or other environmental variations
  4. 5. one function of the respiratory system is to produce enzymes that help regulate blood pressure it is called ____ converting enzyme
  5. 6. as air passes through the mouth and nose, it is ____ and moistened, so that dry, cold air does not damage the delicate lungs.
  6. 7. these cavities inside the head are part of the upper respiratory system and sometimes cause headaches if they get infected
  7. 8. if all the surfaces in the alveoli were spread out flat, they would measure between 50 and 75 square meters, about the size of half a ____ court
  8. 10. the respiratory helps maintain the ____ of blood
  9. 13. one function of the respiratory system is defending the respiratory system and other tissues from invasion by
  10. 14. one function of the respiratory system is facilitating the detection of ____ stimuli by receptors in the nasal cavity