Biology/Medicine:
* Endogenous hormones: Hormones produced within the body, like estrogen, testosterone, and insulin.
* Endogenous opioids: Natural painkillers produced by the body, such as endorphins.
* Endogenous bacteria: Bacteria that are normally present in the body and are usually beneficial.
Economics:
* Endogenous growth theory: This theory emphasizes how economic growth is driven by factors that are internal to the economy, such as technological innovation, human capital, and knowledge.
* Endogenous variables: Variables in an economic model that are determined within the model itself, as opposed to being determined outside the model.
Other:
* Endogenous rhythm: A biological rhythm, like the sleep-wake cycle, that is generated internally by the body's own biological clock.
* Endogenous processes: Processes that are initiated and controlled from within a system.
In essence, "endogenous" means something that originates from within a system or organism, rather than being introduced from the outside.
It's important to note that the context in which "endogenous" is used can significantly affect its meaning.
