Respiratory System

4. They enable the entry and exit of air and other gasses through the nasal cavities
6. is the organ that food travels through to reach the stomach for further digestion
7. caused by a virus
9. he main muscle of respiration, separating the thoracic and abdominal cavities, and facilitating breathing by contracting to expand the chest cavity and drawing air in, then relaxing to exhale
11. humans have two ________
12. upper respiratory infection (URI)
13. acute or chronic inflammation of bronchi
14. poisoning by bacteria toxin (Clostridium botulinum)
16. hollow, air-filled cavities located within the bones of the skull, surrounding the nasal passages
18. alveoli permanently damaged
19. provides a chamber for voice
20. (voice box)

1. carry air into your lungs
2. deepest in the lungs
3. _______ are damaged by smoking
5. the smallest airways in the lungs
6. Its primary function is to prevent food and liquids from entering the lungs during swallowing
8. also known as the windpipe
10. the opening between the vocal folds
15. spasmodic contraction of bronchi
17. allows air to pass from your nose into your windpipe (trachea) and eventually, into your lungs