Across
- 4. The total amount of blood pumped by the heart each minute.
- 8. Tiny air sacs in the lungs where gas exchange occurs.
- 9. Gas taken into the body to fuel energy production.
- 11. When a muscle shortens or lengthens to produce movement.
- 13. The chemical processes in the body that release energy.
- 15. Tiredness or reduced ability of muscles to contract after exercise.
- 17. Organs where oxygen enters and carbon dioxide leaves the blood.
- 18. Narrowing of blood vessels to reduce blood flow.
- 19. Organ that pumps blood around the body.
- 20. A group of fibres and their motor nerve working together.
Down
- 1. Regular exercise to improve fitness and performance.
- 2. The movement of gases from high to low concentration at the alveoli.
- 3. The amount of blood pumped out of the heart per beat.
- 5. Waste gas removed from the body during breathing.
- 6. By-product formed during high-intensity exercise when oxygen is limited.
- 7. Widening of blood vessels to increase blood flow.
- 10. The amount of air breathed in or out per breath.
- 12. body’s immediate change to meet the demands of exercise.
- 14. The process of activating more motor units to create force.
- 16. Individual muscle cell that contracts to produce movement.