Respiration in plants and animals

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Across
  1. 3. The process of breaking down of pyruvate
  2. 5. Breathing in
  3. 7. Where is pyruvate formed?
  4. 9. Breathing out.
Down
  1. 1. Cramps are caused by the buildup of this acid in the muscles.
  2. 2. Air is taken in through which place?
  3. 4. When we breathe in we lift our ribs and flatten this part of the respiratory system
  4. 6. Broken down form of glucose, a three carbon mole
  5. 8. Small balloon like structures within the lungs.