Respiratory system

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Across
  1. 3. What are the alveoli of the lungs covered with
  2. 5. Chronic non-infectious inflammatory disease of the respiratory tract
  3. 7. Malignant neoplasm of the lungs, originating from the epithelial tissue of the bronchi
  4. 9. The concentration of which gas is most in the blood at the time it is in the aorta
  5. 10. The main organ of the respiratory system
Down
  1. 1. A disease caused by the loss of its shape by the alveoli
  2. 2. The process is the reverse of exhalation
  3. 4. Through which veins does blood flow from the lungs to the heart
  4. 6. A tube of cartilaginous semicircles from the larynx to the bronchi
  5. 8. A frequent symptom of diseases of the respiratory system