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| homeostasis is the relitively constant internal physical and chemical conditions that orginisms maintain. |
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Term
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Definition
| tissue is a group of similar cells that performs a particular function. |
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Term
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Definition
| a organ is a group of tissues that work together to perform closely related functions. |
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Term
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Definition
| the organ system is a group of organs that work together to perform a specific function. |
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Term
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Definition
| a receptor is on or in a cell, a receptor is a specific protien to whose shape fits that of a specific molecular messenger. |
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