Across
- 2. where aerobic respiration occurs in cells
- 3. carries oxygen around the body in blood
- 4. heart beat
- 5. the movement of molecules into and out of a cell
- 6. a by-product of aerobic respiration
- 10. by-product of aerobic respiration
- 12. gas exhaled on breathing
- 15. breathe in
- 16. air sacs in the lungs
- 17. a sugar used by cells in aerobic respiration
- 20. movement of blood around the body
Down
- 1. carries oxygen in red blood cells
- 3. transfers energy from plants and animals
- 7. the smallest unit of life
- 8. chemicals used in a chemical reaction
- 9. breaks down large food molecules
- 11. gas used in aerobic respiration
- 13. breath out
- 14. carbon dioxide dissolves in this fluid in blood
- 16. in air
- 18. vessels carrying blood around the body
- 19. chemicals produced in a chemical reaction