The Respiratory System

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Across
  1. 1. tubes forming the respiratory system
  2. 3. where cellular respiration takes place
  3. 6. protective secretion of the mucus membranes
  4. 8. collapsed lung
  5. 9. keeps alveoli from collapsing
Down
  1. 2. the uppermost cartilage of the larynx
  2. 4. the movement of gases between air & blood
  3. 5. contains vocal cords
  4. 7. tubes from trachea to lungs