Question

Cholecalciferol (an inactive form of vitamin D) must undergo 2 conversion steps before it becomes the active form of vitamin D, calcitriol. Those steps take place in the _____ and the _____

Answer 1

Those steps take place in the liver and the kidneys.

Step-by-step explanation:

Cholecalciferol, which is the inactive form of vitamin D, is first transported in the blood via vitamin D binding protein (DBP) to the liver.

Upon reaching the liver, cholecalciferol will undergo chemical changes, forming calcidiol, the deposit form of vitamin D.

After that, calcidiol goes to the kidneys, which will form calcitriol, the metabolically active form of vitamin D.