Respiratory System

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Across
  1. 2. A dome shaped muscle that helps breathing
  2. 6. Air sacs in the lungs for gas exchange
  3. 8. Organs used by fish to breath
  4. 9. Cells that produce mucus in the trachea
  5. 10. Organ with hair and used to smell
  6. 11. Movement of molecules from areas of high concentration to low concentration
  7. 12. A colourless and odourless gas which is associated with deaths due to faulty boilers
  8. 13. A major by-product of respiration in man
  9. 14. Red blood cells
Down
  1. 1. Tube-like organ made of cartilage which divides to form bronchi
  2. 3. The process of taking air into the lungs
  3. 4. Bones protecting the lungs
  4. 5. Gas which is most prevalent in air
  5. 7. Blood vessel that carries blood from the heart to the lungs for oxygenation