a group of similar cells that perform a specific function

a body structure that is composed of different kinds of tissues that work together .

a group of organs that work together to perform a major function

an organ that produces and releases chemicals either throughout ducts or into the blood stream.

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human Body systems

Term	Definition
Tissue	a group of similar cells that perform a specific function
organ	a body structure that is composed of different kinds of tissues that work together .
organ system	a group of organs that work together to perform a major function
Gland	an organ that produces and releases chemicals either throughout ducts or into the blood stream.
Hormone