All of the following organs are required for the complete synthesis of activated vitamin D except?

Question

a.) skin.

b.) liver.

c.)kidney.

d.)intestines.

Answer 1

Vera, you seem to have a large number of homework-sounding questions....  Anyway, in the interest of not allowing misinformation to dominate, I feel the need to speak up here.

Pre-vitamin D is synthesized in the skin with ultraviolet light.  It then spontaneously becomes vitamin D, which requires two subsequent steps of activation: hydroxylation at the 25 and 1 positions.  The 25-hydroxylation step takes place in the liver, while the 1-alpha-hydroxylation step takes place in the kidney:

http://en.wikipedia.org/wiki/Vitamin_D#S...

In short, the skin, liver and kidneys are all needed, so (d) is the correct answer.

Answer 2

kidneys