| A | B |
|---|
| Bones | Composed mainly of calcium |
| Bones | Made up of living bone cells and connective |
| Bone Marrow | Produce red blood cells, white blood cells, and platelets |
| Joints | Where bone meets bone in an organism |
| Immovable Joint | Bones that are tightly fitted together |
| Ball-and-Socket Joint | Can move in all directions |
| Hinge Joint | Permits back and forth motion |
| Cartilage | Unlike bone, cartilage is flexible and elastic and functions to absorb shock |
| Skeletal Muscle | Are voluntary, striped in appearance, attached to bone, and is involved in locomotion |
| Smooth Muscle | Are involuntary, not striped in appearance, and make up the walls of internal organs and blood vessels |
| Cardiac Muscle | Are involuntary, striped in appearance, and found in the heart |
| Ligaments | Connect bone to bone |
| Tendons | Connect muscle to bone |
| Calcium | Mineral that is important for strong bones |
| 600 | number of skeletal muscles in your body |
| 206 | number of hard bones in your body |
| Tissue | made up of similar cells that work together |
| Organ | Several kinds of tissues grouped together |
| Organ system | A group of organs working together |
| Cranium | head bone surrounding your brain |
