Across
- 1. Composed of the heart and blood vessels; responsible for transporting oxygen to working muscles
- 4. When the body can't supply oxygen fast enough during the start of intense activity
- 10. Organelles in muscle cells where oxygen is used to produce ATP
- 12. muscle cells that contract to create movement and require oxygen to function efficiently
- 14. A protein in red blood cells that carries oxygen from the lungs to muscles
- 17. Oxygen needed after exercise to restore the body to a resting state
Down
- 2. Energy production without oxygen; used in short bursts of intense activity
- 3. Essential for producing energy in muscle cells, especially during aerobic activity
- 5. Tiny blood vessels surrounding muscle fibers that deliver oxygen and remove waste
- 6. A muscle protein that stores and transports oxygen to mitochondria
- 7. The amount of blood pumped by the heart per beat
- 8. The period muscles need post-exercise to return to normal, aided by oxygen supply
- 9. The energy molecule muscles use to contract; oxygen helps produce it efficiently
- 11. Energy production in cells using oxygen supports endurance activity
- 13. A byproduct of anaerobic metabolism when oxygen supply is limited
- 15. The maximum rate at which the body can use oxygen during exercise, a key fitness measure
- 16. The ability to sustain physical activity, heavily dependent on efficient oxygen use
- 18. The amount of oxygen used by the body