| A | B |
|---|
| skeleton | all the bones in your body |
| femur | the longest bone in your body |
| ball and socket | a joint like your hip or shoulder that lets you move in a circle |
| hinge | a joint like your knee |
| skull | the bones that protect your brain |
| marrow | the part of your bone that makes new blood |
| spine | your backbone |
| joint | a place where bones meet |
| bone | one part of your skeleton |
| rib cage | protects your heart and lungs |
