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| the basic unit of structure and function in a living thing |
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| forms the outside border of a cell |
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| directs the cell's activities and hold information that controls a cell's functions |
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| a clear, jelly-like substance that contains many cell structures |
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| a group of similar cells that perform the same function |
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| made of cells that contract, or shorten, to make parts of your body move |
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| directs and controls the processes of the body; carry electrical messages back and forth |
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| provides support for your body and connects all its parts |
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| covers the surface of your body, inside and out |
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| a structure that is made up of different kinds of tissues |
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| a group of organs that work together, carrying out major functions |
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| all the bones in your body |
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| attached to the bones of your skeleton and provide the force that moves your bones |
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| a place in the body where two bones come together |
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| a substance that you get from food and that your body needs to carry out processes |
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| nutrients move from the digestive system into the bloodstream |
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| release chemical signals directly into the bloodstream |
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| a signal in the environment that makes you react |
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| what your body does in response to a stimulus |
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| chemical signals released by the endocrine system |
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| the condition in which an organism's internal environment is kept stable in spite of change in the outside environment |
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Definition
| the reaction of your body to possibly threatening, challenging, or uncomfortable events |
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