Across
- 6. The organ responsible for pumping blood
- 7. Physical activity that improves fitness
- 9. The process of taking air into the lungs
- 10. The body's ability to resist certain diseases
- 11. A chemical messenger produced by glands
- 12. The process of breaking down food
Down
- 1. The ability to continue physical activity for a period of time
- 2. The body's framework of bones
- 3. A mineral important for strong bones and teeth
- 4. The body's main organ for thinking
- 5. A substance needed by the body in small amounts for health
- 8. A nutrient needed for growth and repair