Question

endogenous Vitamin D can be obtained from food and supplements, but it's also an endogenous vitamin, produced by the body when the skin is exposed to sunlight. ˌɛnˈdɔʤɛnəs

Accepted Answer

Developing or originating within a cell, organ, body, or system. When biologists need to make a distinction between things that are produced within a cell or organ and things that affect it from the outside, they use the terms endogenous and exogenous. It used to be thought, for instance, that mutations in cells always resulted from exogenous causes, until it was discovered that substances in the body, including those called oxidants, could cause them endogenously as well. “Circadian rhythms”—the regular cycles, roughly 24 hours in length, that plants, animals, and humans rely on to regulate their days—are endogenously generated and don't actually depend on the sun for their timing.

word	endogenous
definition	Developing or originating within a cell, organ, body, or system.
eg_sentence	Vitamin D can be obtained from food and supplements, but it's also an endogenous vitamin, produced by the body when the skin is exposed to sunlight.
explanation	When biologists need to make a distinction between things that are produced within a cell or organ and things that affect it from the outside, they use the terms endogenous and exogenous. It used to be thought, for instance, that mutations in cells always resulted from exogenous causes, until it was discovered that substances in the body, including those called oxidants, could cause them endogenously as well. “Circadian rhythms”—the regular cycles, roughly 24 hours in length, that plants, animals, and humans rely on to regulate their days—are endogenously generated and don't actually depend on the sun for their timing.
IPA	ˌɛnˈdɔʤɛnəs

Endogenous Body Produced Things Endogenously Developing Originating Cell