Endogeny (biology)

Endogenous substances and processes are those that originate from within a living system such as an organism, tissue, or cell.[1]

For endogeny or endogeneity in other contexts, see Endogeneity and Exogeny.

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.

References
  1. "Endogenous | Define Endogenous at Dictionary.com". Dictionary.reference.com. Retrieved 2011-07-11.
  • The dictionary definition of endogeny at Wiktionary
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