Across
- 5. controls the activities of the cell
- 8. send messages and coordinate activity of the body
- 9. small and roughly spherical
- 10. two tubes that travel to the left and right lungs
- 12. double-layered covering
- 13. contract to allow movement
- 14. deliver oxygen to cells and remove carbon dioxide from cells
Down
- 1. Rod shaped formed by membranes
- 2. store calcium and build new bone
- 3. store energy in the form of fat
- 4. 2 air-filled, spongy organs
- 6. stores and contains food particles, waste materials, excess water
- 7. detect sound vibrations
- 11. closely stacked and flattened sacs
- 15. jelly-like substance