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{{Short description|Substances & processes originating within an organism, tissue, or cell}}
{{For|endogeny or endogeneity in other contexts|Endogeneity (disambiguation){{!}}Endogeneity|Exogeny}}
For example, [[estradiol]] is an endogenous [[estrogen]] [[hormone]] produced within the body, whereas [[ethinylestradiol]] is an exogenous synthetic estrogen, commonly used in [[birth control pills]].
==References==
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==External links==
*{{Wiktionary-inline|endogeny}}
[[Category:Biology]]
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Endogenous substances and processes are those that originate from within a living system such as an organism, tissue, or cell.[1]
In contrast, exogenous substances and processes are those that originate from outside of an organism.
For example, estradiol is an endogenous estrogen hormone produced within the body, whereas ethinylestradiol is an exogenous synthetic estrogen, commonly used in birth control pills.