Dietary cholecalciferol must be further hydroxylated in order to be active vitamin d. the first hydroxylation occurs in the to produce

Liver, 25-hydroxycholecalciferol.

Explanation:

Vitamin D is a fat soluble vitamin that increases the absorption of phosphate and calcium in the body. Vitamin D2 and D3 are most important for the human health.

The hydroxylation of cholecalciferol occur in the liver in order to be active vitamin D. The first hydroxylation of cholecalciferol produces 25-hydroxycholecalciferol.

Thus, the answer is liver, 25-hydroxycholecalciferol.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.