Across
- 1. Maintains posture
- 4. Keeps blood supplied with oxygen
- 7. Breaks down food
- 9. Secretes regulatory hormones
- 10. Returns fluids to blood vessels
- 11. Transports materials throughout the body
Down
- 2. Site of blood cell formation
- 3. Activates muscles and glands
- 5. Forms the external body covering
- 6. Production of offspring
- 8. Eliminates nitrogenous wastes