Across
- 1. they cover the surface of your body
- 5. the main support structure of your body, especially the upper body and back
- 6. it pumps blood throughout the body
- 8. it houses the brain
- 11. they come in pairs and produce urine
- 12. they produce red blood cells
Down
- 2. they digest and absorb nutrients
- 3. they make up the skeletal system
- 4. the center of the nervous system
- 7. it stores urine
- 9. we use it to breathe
- 10. it works hard when you smoke or drink alcohol