| A | B |
|---|
| Structure | The arrangement of parts on an organism or an object. |
| Function | The activity of each part in an organism. |
| Organism | A living thing that can carry out life processes by itself. |
| Tissue | A group of similar cells that perform a common function. |
| Organ | A structure made up of a collection of tissues that carries out a specialized function. |
| Organ System | A group of organs that work together to perform body functions. |
| Skeletal System | Supports and protects the body and allows it to move. |
| Muscular System | Made up of muscles that allow your body to move and be flexible. |
| Circulatory System | Works to move fluids around your body and protect it from disease. |
| Respiratory System | Gathers oxygen from the environment and gets rid of carbon dioxide from the body. |
| Digestive System | Breaks down the food you eat into nutrients that can be used as building materials and that can provide energy for cells. |
| Excretory System | Eliminates cellular wastes from the body through the lungs, kidneys, skin and digestive system. |
| Nervous System | Made up of structures that control the actions and reactions of the body in response to stimuli from the environment. |
| Endocrine System | Controls body functions and helps maintain homeostasis by using hormones. |
