Calcitriol acts on
Bioactive vitamin D or calcitriol is a steroid hormone that has long been known for its impoant role in regulating body levels of calcium Nuclear or cytosolic receptors include the binding sites for steroid hormones, thyroid hormones, vitamin D, and retinoic acids Ref-Goodman and Gillman 12th/e p1282
G protein coupled receptor
Cytosolic receptor
Intranuclear receptor
Enzymatic receptors
General anatomy