Across
- 1. system your body’s command center
- 5. allow mammals to move
- 6. fist-sized organ pumps blood throughout body
- 7. tissue that only exists in the heart
- 8. type of material consisting of specialized cells
Down
- 2. use nerve signals with nervous system
- 3. warm-blooded vertebrates with hair
- 4. vessels arteries, veins, capillaries
- 9. located in a lot of the hollow organs of body