| A | B |
|---|
| Unicellular | Living things composed of only one cell |
| Nerves | Tissue that carries messages throughout our bodies |
| Digestive System | System that breaks down food and absorbs nutrients |
| Organism | Any living thing |
| Multicellular | Living things composed of more than one cell |
| Organ System | Group of organs working together to perform a specific job |
| Muscle | The only tissue in your body that is able to contract or shorten |
| Organ | Group of tissues working together to do a job |
| Excretory System | System that removes solid and liquid wastes |
| Tissue | Group of cells working together to do a job |
| Food | Needed to give living things energy to live |
| Muscular System | System that works with bones to allow body movement |
| Connective | Tissue that provides support and connects all of our body parts |
| Cells | Building blocks of living things |
| Homeostasis | Process by which the body’s internal environment is kept stable or balanced. |
| Epithelial | Tissue that makes up the outer covering/top layer of skin in humans |
| Skeletal System | System that protects and supports; also stores minerals |
| Respiratory System | Exchanges oxygen and carbon dioxide between blood and air. |
| Reproductive System | System that allows reproduction and controls male and female functions |
| Integumentary System (Skin) | Protects and regulates temperature, and prevents water loss. May also serve to it may serve to waterproof, cushion and protect the deeper tissues |
| Endocrine System | System of glands that regulate metabolism and reproduction |
| Circulatory System | System that transports nutrients and wastes and plays a role in the immune response. |
| Immune System | System that fights disease and controls the immune response. |
