| Term | Definition |
| ligament | connective tissue that attaches a bone to a bone |
| ball and socket | the name for the joint for the hips and shoulders |
| immovable joint | in the cranium |
| discs between vertebrae | made of cartilage |
| spongy bone | not soft and adds structural support |
| fracture | a break in a bone |
| sprain | occurs from excessive pulling or tearing of a ligament |
| tendon | connective tissue that attaches a bone to a muscle |
| joints | where bones come close to other bones |
| hinge joint | the joints at elbows and knees |
| pivot joint | allows the neck to bend up and down and side to side |
| blood cells | made in the marrow found in some bone cavities |
| membrane | a tough, thin layer that surrounds the bone shaft and helps repair injuries |
| dislocation | an injury that occurs when a bone is forced out of its joint |
| osteoporosis | a disorder of weak bone tissue that affects millions of older Americans |
| backbone | vertebrae |
| collarbone | clavicle |
| phalanges | fingers & toes |
| shin | tibia |
| shoulder blade | scapula |
| epithelial tissue | forms protective surface on the outside of the body |
| nerve tissue | carries messages between the brain and spinal cord |
| muscle | has the ability to contract |
| connective tissue | includes bone, blood, and fat |
| heart | contains nerve, muscle, epithelial, and connective tissue |
| skeletal system | must 1) shape and support, 2) allow movement and 3) produce blood cells |
| For strong bones you need | calcium, vitamin D, exercise |