Across
- 2. Bones that protect the lungs
- 4. Anaerobic respiration in yeast
- 5. Extra oxygen needed after exercise
- 7. Waste product that causes muscle cramps
- 13. Needed in small amounts to stay healthy
- 15. Substance the body needs to stay alive and healthy
- 16. Fat used for energy storage and insulation
- 17. Sugar produced during photosynthesis
- 19. Structure where photosynthesis occurs
- 21. To breathe out
- 22. Helps food move through the digestive system
- 23. Where aerobic respiration happens in cells
- 24. Used for growth and repair of body tissues
- 26. Green pigment that absorbs light energy
- 27. Tiny air sac where gas exchange occurs
- 29. To breathe in
Down
- 1. Eating the right nutrients in correct amounts
- 3. Releases energy using oxygen
- 6. Tube that branches into each lung
- 8. Main source of energy for the body
- 9. Organism that eats other organisms
- 10. Muscle used for breathing
- 11. Organism that makes its own food using sunlight
- 12. Process plants use to make food using light
- 14. Essential nutrient like calcium for bones
- 18. Releases energy without oxygen
- 20. Organs where gas exchange happens
- 25. Tube that carries air to the lungs
- 28. Taking in oxygen and removing carbon dioxide