2. the formation of alcohol from sugar by microorganisms due to anaerobic respiration

3. respiration which does not require oxygen

4. a small molecule which stores energy temporarily in a readily usable form which can be quickly transferred when required

5. a chemical for detecting carbon dioxide. Its colour changes from red to yellow in high carbon dioxide concentration

6. the product formed in human muscles during heavy exercises

7. a chemical for detecting carbon dioxide. Its colour changes from colourless to milky in high carbon dioxide concentration

8. a feeling of tiredness due to the building up of lactic acid in muscles

9. the amount of extra oxygen needed to remove all the lactic acid made during heavy exercise

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