Outline the conversion of the different forms of vitamin A and the chief functions of each.
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Q. 2In vitamin D deficiency, production of ____________________, a protein that binds calcium in the intestinal cells, slows.
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Q. 3In ____________________, the bones fail to calcify normally, causing growth retardation and skeletal abnormalities.
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Q. 4Of all the members of the vitamin E family, only ____________________ is maintained in the body and can meet the body's needs for the vitamin.
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Q. 5Though called a vitamin, the active form of vitamin D is actually a(n) ____________________.
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Q. 6Blindness due to vitamin A deficiency is called ____________________.
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Q. 7Because the body can derive vitamin A from both retinoids and carotenoids, its content in foods and its recommendations are expressed as ____________________.
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Q. 8The innermost membrane of the eye, composed of several layers, including one that contains the rods and cones is called the ____________________.
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