Respiratory System

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Across
  1. 1. thin layer of tissue that covers internal body cavities, the cells of which secrete a fluid that keeps the membrane moist, 2 words together!
  2. 3. a wall dividing two cavities, such as the nasal septum, which separates the two nostrils
  3. 4. any hairlike structure, singular form!
  4. 6. to breathe in
  5. 7. the product of cellular respiration that we exhale, 2 words together!
  6. 10. a small part into which a bronchus divides
  7. 11. the degree of acidity or alkalinity of a substance
  8. 12. small air sacs in the lungs, plural form!
  9. 14. state in which the regulatory mechanisms of the body maintain a constant internal environment
  10. 16. tasteless, odorless, colorless gas essential for human respiration
  11. 17. windpipe
Down
  1. 2. breathing, ventilation
  2. 5. tough and elastic connective tissue more rigid than ligaments but less dense than bone
  3. 8. phrase, after a physical exercise, 2 words together!
  4. 9. to breathe out
  5. 13. moving or spreading out of a substance at random, rather than by chemical reaction or application of external forces
  6. 15. moist tissue layer lining hollow organs and cavities of the body that open to the environment, 2 words together!