Vitamin D- Provitamins, active form, functions, Rickets, serum level, RDA, sources

Provitamins
Ergocalciferol and Cholecalciferol
transport and storage ad 25- OH Cholecalciferol
Active form- Calcitriol
Functions
on three target tissues
Intestinal cell- increases absorption of calcium
Bone- Mineralization of bones
Kidney- increases tubular absorption of calcium
increases serum calcium level
Deficiency manifestation
Rickets in children
Osteomalacia in adult
RDA- 400 IU in children, 200 IU in Adult
Sources- Sunlight, fish, egg yolk etc.

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1:05 chemistry part
2:10 precursors
2:45 Activation of Vit D
5:59 Sources
6:39 RDA
7:28 Biochemical function
12:24 Deficiency Symptoms
17:58 Normal Level
19:07 Other Functions

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