Biology Crossword

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Across
  1. 3. a cell that fights infections
  2. 5. network surrounds the alveolus
  3. 9. helps building amino acids
  4. 10. protective lining that is sticky
  5. 11. carry out and in air
  6. 13. strengthen bones and teeth
  7. 14. break down carbohydrates for energy
Down
  1. 1. carries oxygen around the body
  2. 2. inhale and exhale air through lungs
  3. 4. improves eye vision
  4. 6. essential component of haemoglobin
  5. 7. a respiratory chronic disease
  6. 8. yellowish liquid component of blood
  7. 9. slippery membrane surrounding the lungs
  8. 12. tiny hair sweeps out microbes