Fat Soluble Vitamins. Vitamins A, D, E and K. Vitamin A and Beta-Carotene. Also known as retinol, retinal, retinoic acid Vitamin A is found in the body in compounds known as retinoids: retinol, retinal, and retinoic acid.
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Vitamins A, D, E and K
Vitamin A maintains healthy cells in the mucous membranes.
Without vitamin A, the normal structure and function of the cells in
the mucous membranes are impaired.
Fig. 11-4, p. 372
(a precursor made in the liver from cholesterol)
Ultraviolet light from the sun
In the liver:
In the kidneys:
(an inactive form)
25-hydroxy vitamin D3
1,25-dihydroxy vitamin D3 (active form)
Fig. 11-9, p. 377