| A | B |
|---|
| CELL | The basic unit of structure and function in living things |
| CELL MEMBRANE | The outside boundary of a cell; controls which substances enter or leave the cell |
| NUCLEUS | The control center of a cell that directs the cell’s activities |
| CYTOPLASM | The region of a cell located inside the cell membrane or between the cell membrane an nucleus; contains a gel-like material and cell organelles |
| TISSUE | A group of similar cells that perform a specific function in an organism |
| MUSCLE TISSUE | A body tissue that contracts or shortens, making body parts move |
| NERVE TISSUE | A body tissue that carries messages back and forth between the brain and every other part of the body |
| CONNECTIVE TISSUE | A body tissue that provides support for the body and connects all of its parts |
| EPITHELIAL TISSUE | A body tissue that covers the surface of the body, inside and out |
| ORGAN | A structure of the body that is composed of different kinds of tissue |
| ORGAN SYSTEM | A group of organs that work together to perform a major function in the body |
| HOMEOSTASIS | The process by which an organism’s internal environment is kept stable in spite of changes in the external environment |
| STRESS | The reaction of a person’s body and mind to threatening, challenging or disturbing events |
| VERTEBRA | The bones that make up the backbone of an animal |
| MARROW | The soft tissue that fills the internal spaces in bone |
| CARTILAGE | A connective tissue that is more flexible than bone and that gives support to some parts of the body |
| LIGAMENT | Strong connective tissue that holds together the bones in a moveable joint |
| JOINT | A place where two bones come together |
| OSTEOPOROSIS | A condition in which the body’s bones become weak and break easily |
| INVOLUNTARY MUSCLE | A muscle that is not under conscience control |
| VOLUNTARY MUSCLE | A muscle that is under conscious control |
| SKELETAL MUSCLE | A muscle that is attached to bones of the skeleton |
| TENDON | Strong connective tissue that attaches a muscle to a bone |
| SMOOTH MUSCLE | Involuntary muscle found inside many internal organs of the body |
