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Cells
6th grade
| Question | Answer |
|---|---|
| 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 |
| What are the levels of organization in the human body from smallest to greatest unit? | cells, tissues, organs, and organ systems |
| organ systems | the human body is made up of eleven organ systems: circulatory, digestive, nervous, skeletal, endocrine, muscular, excretory, respiratory |
| muscle tissue | can contract or shorten--muscle tissue makes parts of your body move |
| nervous tissue | carries electrical messages back and forth between the brain and other parts of the body |