Respiratory system

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Across
  1. 3. the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals; the voice box.
  2. 6. exhalation of breath.
  3. 8. Tiny air sacs at the end of the bronchioles
  4. 9. During inhalation (top), the diaphragm descends and air fills the lungs.
Down
  1. 1. The hollow tube inside the neck that starts behind the nose and ends at the top of the trachea
  2. 2. The large air passages that lead from the trachea (windpipe) to the lungs
  3. 4. two external openings of the nasal cavity in vertebrates that admit air to the lungs and smells to the olfactory nerves.
  4. 5. the area of the body between the chest and the pelvis where the intestines are located
  5. 6. the muscle tube that allows food to travel from the throat to the stomach.
  6. 7. a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.