Across
- 1. the smallest structural and functional unit of an organism
- 5. carry oxygenated blood
- 9. the middle layer of skin
- 10. type of ribs that connect to the false ribs
- 11. a material making up the body
- 12. carry deoxygenated blood
Down
- 2. the top layer of skin
- 3. keeps you alive
- 4. type of ribs that connect to the spine and sternum
- 6. a group of objects such as the cardiovascular system.
- 7. type of ribs connecting to the seventh rib.
- 8. an organ that helps you breath