| A | B |
| It carries messages in your body | Nervous sytem |
| It has 206 bones | Skeletal system |
| It is made of muscles that are attached to and move the bones | Muscular system |
| It protects and fights against disease | Immune system |
| It includes skin, hair, and nails | Integumentary system |
| It produces off-spring | Reproductive system |
| It produces chemicals that regulate and control body functions. | Endocrine systems |
| It turns food into nutrients | Digestive system |
| It carries oxygen into the lungs. | Respiratory system |
| It moves waste materials out of the body. | Excretory system |
| It uses blood and blood vessels to move oxygen and nutrients | Circulatory system |