Respiratory system

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Across
  1. 3. Pulmonary vesicles
  2. 4. The main respiratory organ of humans
  3. 6. Сonnective tissue sheath covering the lungs
  4. 7. Two tubes, each leading to a "its" lung
  5. 8. An organ containing the vocal cords
Down
  1. 1. Formations located behind the soft palate and at the entrance to the esophagus and pharynx
  2. 2. Upper pharynx
  3. 5. Wide tube consisting of cartilaginous half-rings