Human Respiration

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)
  2. 6. A flap of cartilage that covers the windpipe while swallowing (10)
  3. 8. A mechanical device in a camera that controls size of aperture of the lens (9)
  4. 9. Inflammation of the membranes lining the ___ tubes (10)
  5. 10. An abnormal condition of the lungs marked by decreased respiratory function (9)
  6. 12. Gas in the air that we need to breathe (6)
  7. 13. Serious disease where cells grow out of control (6)
  8. 14. Either of two saclike respiratory organs in the chest of vertebrates (plural) (5)

Down

  1. 1. Respiratory disease characterized by inflammation of the lung parenchyma with congestion caused (9)
  2. 2. Any of the minute blood vessels connecting arterioles with venules (plural) (11)
  3. 4. Respiratory disorder characterized by wheezing (6)
  4. 5. Any of the smallest ___ ducts (10)
  5. 7. One of the tubules forming the respiratory system of most insects and many arachnids (7)
  6. 9. Either of the two main branches of the trachea (8)
  7. 11. Protective secretion of the mucous membranes (5)