Does the skin produce hormones that are essential for proper calcium absorption from the digestive tract, or does it produce calcitriol? If not, what role does the skin play in the process of calcium absorption?
Calcium absorption requires assistance from Vitamin D. The active form of Vitamin D is known as
Now,skin contains a precursor of this thing known as
Now this Pre-cholecalciferol undergoes thermal isomerization over hours to form Cholecalciferol(Vitamin D),that gets absorbed to blood stream.
This Cholecalciferol is hydroxylated in liver to form
After this thing comes to kidney it undergoes another hydroxylation,which can be of two types,one is forming of
Or,it can make