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== <span></span> [[Category:OpenPages]] Introduction ==

==Introduction==

 

Calcium is essential for many intracellular and extracellular functions. These include:

Calcium is essential for many intracellular and extracellular functions. These include:

'''Calcitriol''', or '''1,25-dihydroxycholecalciferol''' is the biologically active metabolite of vitamin D. It is classified as a steroid hormone and acts to raise blood calcium levels.  

'''Calcitriol''', or '''1,25-dihydroxycholecalciferol''' is the biologically active metabolite of vitamin D. It is classified as a steroid hormone and acts to raise blood calcium levels.  

There are two dietary sources of Vitamin D3 -

There are two dietary sources of Vitamin D3

 

1. '''Vitamin D2''' is produced in plants (ergocalciferol).  

1. '''Vitamin D2''' is produced in plants (ergocalciferol).  

Cheeke, R. (2010) '''Comparative Animal Nutrition and Metabolism''' ''CABI''

Cheeke, R. (2010) '''Comparative Animal Nutrition and Metabolism''' ''CABI''