1. Vitamin D is converted to its active form by the
A. skin and liver.
B. small intestines and kidneys.
C. fat tissue and liver.
D. kidneys and liver.
E. skin and small intestine.
Vitamin D is carried in the bloodstream to the liver, where it is converted into the prohormone calcifediol. Circulating calcifediol may then be converted into calcitriol, the biologically active form of vitamin D, in the kidneys.
