Respiratory system

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Across
  1. 1. The hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans
  2. 4. A tube-like structure having cartilaginous ring outside
  3. 5. A tiny branch of air tube in the lungs
  4. 7. A dome-shaped musucular organ that plays a major role in breathing by contracting and relaxing.
  5. 8. Air enters first through this passage
Down
  1. 2. Many tiny air sacs of the lungs which allow for rapid gaseous exchange.
  2. 3. Major air passages of the lungs which divide from the windpipe.
  3. 6. A cavity behind the nose and mouth connecting to the oesophagus