a group of similar cells that perform a specific function

a body structure that is composed of different kind 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 through ducts or into the bloodstream

(1) the chemical produced by an endocrine gland (2) A chemical that affects growth and development

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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 kind 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 through ducts or into the bloodstream
Hormone	(1) the chemical produced by an endocrine gland (2) A chemical that affects growth and development