Respiratory System

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 5. Abnormally high acidity of the blood and other body tissues (8)
  2. 8. A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas (8)
  3. 10. The bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs (13)
  4. 11. The organ of smell and entrance to the respiratory tract (4)
  5. 14. A chemical agent capable of reducing the ___ tension of a liquid in which it is dissolved (10)
  6. 15. Tough elastic tissue (9)
  7. 16. Either of two saclike respiratory organs in the chest of vertebrates (plural) (5)

Down

  1. 1. Protective secretion of the mucous membranes (5)
  2. 2. The metabolic processes whereby certain organisms obtain energy from organic molecules (11)
  3. 3. Gas in the air that we need to breathe (6)
  4. 4. A cartilaginous structure at the top of the trachea (6)
  5. 6. One of the tubules forming the respiratory system of most insects and many arachnids (7)
  6. 7. A medication to be taken by ___ it (10)
  7. 9. United States writer (5)
  8. 12. A mechanical device in a camera that controls size of aperture of the lens (9)
  9. 13. Either of the two main branches of the trachea (8)