respiration

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Across
  1. 3. The part of the cell where aerobic respiration happens (13)
  2. 4. A liquid waste product made in aerobic respiration (5)
  3. 7. A substance made in anaerobic respiration in animals (6,4)
  4. 8. Pain caused by a build-up of lactic acid in muscles (5)
  5. 10. The alcohol made during fermentation (7)
  6. 12. The storage form of glucose in animals (8)
  7. 14. A waste product formed from breaking down excess proteins (4)
  8. 15. Tissues in the body that contract and need energy during exercise (7)
  9. 17. The type of respiration that uses oxygen to release energy (7,11)
  10. 19. The name for anaerobic respiration in yeast cells (12)
  11. 20. A nutrient that can be broken down for energy or stored (3)
  12. 21. Proteins that speed up reactions in the body including respiration (7)
Down
  1. 1. The gas needed for aerobic respiration (6)
  2. 2. A substance made by the liver that helps to digest fats by emulsifying them (4)
  3. 5. Respiration without oxygen that releases less energy (9,11)
  4. 6. How many times the heart beats per minute (5,4)
  5. 9. All the chemical reactions happening in the body (10)
  6. 11. The sugar broken down in respiration to release energy (7)
  7. 13. The amount of oxygen needed to break down lactic acid after exercise (6,4)
  8. 16. A waste gas produced during aerobic respiration (6,7)
  9. 18. How many breaths are taken per minute (8,4)