The Respiratory System

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Across
  1. 2. they are an important part of the body that helps us breathe
  2. 3. tiny hair like structures on the surface of the cell
  3. 6. it is one of the main parts of the respiratory system
  4. 8. any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.
  5. 9. a bronchus or a primary branch off of one.
  6. 10. a large membranous tube reinforced by rings of cartilage
Down
  1. 1. the system of breathing(hint;the title's name)
  2. 4. produce new skin cells.
  3. 5. specialized for the synthesis and secretion of mucus
  4. 7. the main purpose of the Respiratory System