Q:

The skin begins the production of vitamin D in which of the following situations? When

saraalalwane
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2022-09-16
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The skin begins the production of vitamin D in which of the following situations?

When

  1. exposed to ultraviolet radiation
  2. signalled to by the hormone PTH
  3. calcium is present
  4. it adds an hydroxyl group to a cholesterol molecule.
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saraalalwane
2022-09-16
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A: Choice D happens in the liver and in the kidney. PTH signals the

kidney to act on the modifi ed pre-cursor, whereupon an hydroxyl group is

added.

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