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Across 3. The chemical symbol for carbon dioxide 4. The chemical symbol for oxygen 6. The creatine phosphate system mainly uses these muscle fibres 7. O2 is used in this system 8. The by-product of the lactate system 11. Stored carbohydrate 12. The main fuel for the lactate system 13. The aerobic system mainly uses these muscle fibres 14. O2 is not used in these systems 16. This is the main system for a 400m sprint 17. This is the main system for a 100m sprint 18. This is the main system for swimming 150 metres

Down 1. Carbon dioxide is removed from the body through??? 2. The chemical symbol for water 3. This is the main system for shot putt 5. This is the main system for walking 9. The energy currency for the body 10. The main fuels for the aerobic system 15. This is the main system for a marathon