Q:

Vitamin D

safaTerkawi
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2022-08-15
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Vitamin D.

  1. Increases the intestinal absorption of calcium.
  2. Is essential for normal calcification of bones in childhood.
  3. Requires hepatic modification for activation.
  4. Cannot be synthesized in the body.
  5. Deficiency may result in hyperparathyroidism.
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safaTerkawi
2022-08-15
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A. True This occurs mainly in the upper small intestine.

B. True In its absence bones are weak and deformed (rickets).

C. True Initial (25-) hydroxylation occurs here.

D. False It can be produced in mammals by the action of ultraviolet light on 7-dehydrocholesterol in skin.

E. True The low blood calcium level stimulates parathormone secretion.

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