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14.1 Vocab.
| Term | Definition |
|---|---|
| cell | the basic unit of structure and function in a living thing. |
| cell membrane | forms the outside boundary of the cell. |
| nucleus | the control center that directs the cell's activities and contains the information that determines the cell's form and function. |
| cytoplasm | a clear, jellylike substance containing many cell structures called organelles. |
| tissue | a group of similar cells the perform the same function. |
| muscle tissue | carries out movement and can contract. |
| nervous tissue | directs and controls the process of movement. |
| connective tissue | provides support for your body and connects all its parts. |
| epithelial tissue | protects the delicate structures beneath it. |
| organ | a structure composed of different types of tissues. |
| organ system | a group of organs that work together to perform a major function. |
| 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 your body to potentially threatening, challenging, or disturbing events. |