Respiration

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Across
  1. 4. respiration without oxygen
  2. 6. gas needed for aerobic respiration
  3. 9. respiration that uses oxygen
  4. 10. part of the body that works during exercise
  5. 11. process that releases energy from glucose
  6. 13. physical activity that increases respiration
Down
  1. 1. chemical that builds up in muscles when tired
  2. 2. waste gas produced in respiration
  3. 3. pain in your muscle after exercise
  4. 5. how we take in oxygen and remove carbon dioxide
  5. 7. sugar used in respiration
  6. 8. organ that beats in your body
  7. 12. what cells release during respiration