BIOLOGY

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Across
  1. 2. The process of releasing carbon dioxide from the lungs (10 letters)
  2. 5. Waste gas removed from the body via the lungs (6 letters)
  3. 7. The organ system that includes the lungs (11 letters)
  4. 8. The structure that connects the throat to the lungs (7 letters)
Down
  1. 1. Primary gas absorbed by lungs during respiration (6 letters)
  2. 3. The number of lungs in the human body (3 letters)
  3. 4. Tiny air sacs where gas exchange takes place (8 letters)
  4. 6. Tubes that carry air from the trachea into the lungs (7 letters)