1. The Muscular/ Skeletal System By: Grace Van Buren

2. What are bones made of? Bones are made of calcium, phosphorous and collagen.

3. What are the 4 layers of the bone? The first layer of the bone is periosteum. The next layer is the compact layer. Inside the compact layer there is a lot of cancellous. The cancellous protects the bone marrow.

4. What is a skeleton? A skeleton is a bony framework that holds 206 bones.

5. What is the scientific name for a rib cage? The scientific name for a rib cage is a thorax. The thorax also protects the heart, lungs, and the digestive system.

6. What is cartilage? Cartilage is a soft tissue on the end of your nose and ears!

7. Where are about half of the bones in your body? You won’t believe it, but half of the bones in your body are in your hands and feet! Your hands have 54 bones! Your feet have 52 bones!

8. What happens when a muscle relaxes and contracts? When a muscle contracts it becomes shorter and fatter. When a muscle relaxes it gets longer and thinner.

9. Fun Facts Muscles are 2/5 of our body weight. Muscles always pull never push. Muscles only get bigger after 24 to 48 hours after a work out.

10. The End