respiratory system

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Across
  1. 3. either of the two main branches of the trachea
  2. 4. a sheet of muscle below the lungs
  3. 6. another name for windpipe. Allows air to pass from outside the body into your lungs
  4. 9. another word for breathing out
Down
  1. 1. gas that gets absorbed by the alveoli, need this for survival
  2. 2. breathing organs
  3. 5. tiny air sacs at the end of the bronchioles
  4. 7. both the trachea and bronchi both contain rings of _________ which helps to keep their shape
  5. 8. another word for breathing in