Across
- 5. forms the external body covering
- 7. production of offspring
- 8. returns fluids to blood vessels
- 9. part of the skeletal system
- 10. breaks down food
- 11. part of the digestive system
- 12. one of the materials transported through blood
- 13. maintains acid- base balance
- 14. allows locomotion
Down
- 1. protects and supports body organs
- 2. secretes regulatory hormones
- 3. keeps blood supplied with oxygen
- 4. transports materials in body via blood pumped by the heart
- 6. activates muscles and glands
- 8. part of the respiratory system