Across
- 3. Produced by both aerobic and anaerobic systems
- 7. Scientific name for oxygen debt
- 9. When oxygen supply matches demand during steady exercise
- 12. Energy system using oxygen
Down
- 1. Oxygen needed to break down lactic acid
- 2. Energy system without oxygen
- 4. By-product of anaerobic respiration
- 5. Main fuel source for respiration
- 6. Time needed for the body to recover from exercise
- 8. Waste gas produced during respiration
- 10. How long an activity lasts
- 11. Feeling of extreme physical tiredness
- 13. Gas needed for aerobic respiration
- 14. How hard the body is working