| A | B |
|---|
| How many types of bones are there? | four |
| What are two types of bone tissue | compact and spongy |
| Which bone has holes in it? | spongy |
| Which is heavier? Spongy or compact. | compact |
| Name a flat bone. | skull |
| name a long bone | femur |
| name a short bone | metacarpals (fingers) |
| name an irregular bone | vetebrae |
| soft jelly-like material | bone marrow |
| two kinds of marrow | yellow and red |
| marrow with blood cells | red |
| marrow with fat for energy | yellow |
| bone builder | osteoblasts |
| bone director | osteocytes |
| bone digester | osteoclasts |
| break down old bone | bone digester or osteoclasts |
| build new layers of bone | bone builders or osteoblasts |
| mineral in bones that make them hard | calcium |
| bones store __% of calcium | 99 |
| need calcium to form.... | scabs |
