The respiratory system

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Across
  1. 1. a struktural unit of the lung
  2. 3. cartilage that covers the larynx during swallowing
  3. 5. different word for trachea(colloquial)
  4. 8. muscle under the lungs that flattens during inspiration
  5. 9. long curved bones which surround the chest
Down
  1. 1. a cone-shaped spongy organ of respiration contained within the thorax
  2. 2. one of the smaller subdivisions of the bronchial tubes
  3. 4. the air passageway that extends from the larynx to the bronchi
  4. 6. a double-layered membrane that covers the lungs(visceral) and lines the thoracic cavity(parietal)
  5. 7. the external openings of the nose