respiration crossword

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Across
  1. 3. break down nutrient molecule without using oxygen
  2. 5. produced help dough to rise in bread making
  3. 9. connects the mouth and nose to the lungs
  4. 11. the system where breathing takes place
  5. 13. takes place in cell organelle, mitochondria.
  6. 14. also increase during exercise
  7. 15. split to form smaller tubes called bronchioles in the lungs
Down
  1. 1. could show the presence of CO2 in the air we breathe
  2. 2. take advantage of the products of anaerobic respiration in yeast because yeast also produce ethanol
  3. 4. could increase the depth and the rate of breathing
  4. 6. does not produce energy
  5. 7. will diffuse in to the alveoli in gas exchange
  6. 8. is the complete breakdown of glucose to release a relatively large amount of energy
  7. 10. tiny air sacs whre gas exchange takes place
  8. 12. external intercostal muscle ...... when we breathe out