Take A Breath

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 4. Either of two saclike respiratory organs in the chest of vertebrates (plural) (5)
  2. 5. To draw air into, and expel out of, the lungs (7)
  3. 8. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)
  4. 12. A mixture of gases required for breathing (3)
  5. 13. One of the tubules forming the respiratory system of most insects and many arachnids (7)
  6. 15. Gas in the air that we need to breathe (6)

Down

  1. 1. Study of the natural world through experiments (7)
  2. 2. Membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi (8)
  3. 3. The organ of smell and entrance to the respiratory tract (4)
  4. 6. The passage between the pharynx and the stomach (9)
  5. 7. A mechanical device in a camera that controls size of aperture of the lens (9)
  6. 9. Pertaining to ___ (11)
  7. 10. The opening through which food is taken in and vocalizations emerge (5)
  8. 11. Protective secretion of the mucous membranes (5)
  9. 14. A sudden noisy expulsion of air from the lungs that clears the air passages (5)