Across
- 2. Chemical substances that regulate body functions
- 6. Main nutrient source of energy
- 7. Chemical processes in the body to produce energy
- 9. The main organ of the nervous system
- 10. The body’s defense system against disease
Down
- 1. Resistance to a specific infection
- 3. Nutrients needed in small amounts but essential
- 4. Organ that pumps blood
- 5. Process of breaking down food in the body
- 8. Organ used for breathing