Respiratory System - GCSE PE

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Across
  1. 2. The walls of the alveoli are slightly wet to allow for efficient diffusion (5)
  2. 6. This is the wind pipe (7)
  3. 8. The substance in red blood cells that carries oxygen (11)
  4. 11. This muscle contracts when you breathe in to raise the ribs
  5. 13. Breathing out (10)
  6. 14. Breathing in (10)
  7. 15. Sticky substance that traps dust
Down
  1. 1. The process whereby gases move from a high concentration to a low concentration (9)
  2. 3. 78% of inhaled and exhaled air is made up of this
  3. 4. Carbon _______ is a waste product (6)
  4. 5. The nose cavity is also known as the nasal cavity (5)
  5. 7. Muscle that flattens during inhalation (8)
  6. 9. Air sack where gaseous exchange takes place
  7. 10. Small tube between the broncus and alveoli (11)
  8. 12. 16% of exhaled air is made up of this