When exposed to ultraviolet light, keratinocytes convert a steroid precursor into ________, a molecule that is crucial for regulation of calcium levels.
A) calcitriol
B) cholecalciferol
C) calcitonin
D) creatine
E) phosphorus

Question

Quizplus · Accepted Answer

Keratinocytes in the skin convert a steroid precursor into cholecalciferol (vitamin D3) when exposed to ultraviolet light, which is then further processed in the liver and kidneys to form calcitriol, the active form of vitamin D that regulates calcium levels.

When Exposed to Ultraviolet Light, Keratinocytes Convert a Steroid Precursor