Across
- 2. What respiration releases for cell activities
- 4. The process that releases energy from glucose in cells
- 7. The amount of oxygen muscles require during activity
- 9. The object students repeatedly squeezed to test muscle fatigue
- 10. The sugar used by cells as the main source of energy
- 11. Respiration that requires oxygen
- 12. A waste gas produced during aerobic respiration
- 13. A diagram used to show the relationship between two sets of data
- 15. The feeling of muscle tiredness after repeated exercise
- 16. Substance produced in muscles during anaerobic respiration
- 19. The beat you feel in your wrist that shows your heart rate
- 20. A repeated test in an experiment
- 21. Tissue that contracts to produce movement
Down
- 1. Something in an experiment that can be changed measured or controlled
- 3. One of the products of aerobic respiration
- 5. The variable that the scientist changes in an experiment
- 6. Respiration that occurs without oxygen
- 7. A gas required for aerobic respiration
- 8. Physical activity that increases energy demand in muscles
- 14. Number of heart beats per minute
- 17. The usable energy molecule produced during respiration
- 18. The exercise students used to increase heart rate in the lab