Relatively constant internal physical and chemical conditions that organisms maintain

Group of similar cells that perform a particular function

Group of tissues that work together to perform closely related functions

Group of organs that work together to perform a specific function

On or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone

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7.4 Terms

Term	Definition
Homeostasis	Relatively constant internal physical and chemical conditions that organisms maintain
Tissue	Group of similar cells that perform a particular function
Organ	Group of tissues that work together to perform closely related functions
Organ System	Group of organs that work together to perform a specific function
Receptor	On or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone