Respiratory system

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Across
  1. 4. The _________ bronchiole is the portion of the pathway where respiration/gas exchange starts
  2. 5. Respiratory cells which secrete mucus
  3. 7. Indentation on medial side of lung
  4. 8. _____ alveolar cells line alveoli, specialized squamous cells for production of surfactant
  5. 10. The _________ bronchiole is the last segment of conduction portion of respiratory pathway
  6. 12. The ______ side of the tracheal wall contains elastic ligamentous membrane and trachealis muscle
  7. 13. Clusters of tiny, thin walled air sacs were gaseous exchange occurs
  8. 14. Number of secondary bronchi in the right lung
Down
  1. 1. _____ alveolar cells line alveoli, simple squamous epithelium (thin layer allows for gas exchange)
  2. 2. Space between the left and right vocal ligaments
  3. 3. Lipid based coating surface of alveoli to prevent collapse
  4. 6. The pulmonary _______ is where gas exchange actually happens
  5. 9. Branches of the respiratory bronchioles that lead directly to the alveoli
  6. 11. The ______ side of the tracheal wall is lined with c-shaped tracheal rings of hyaline cartilage and anular ligaments