Vitamin D is converted to calcitriol, which acts as a hormone and increases calcium absorption in the gut and kidneys. Vitamin D can be synthesized in the body through exposure to sunlight, but it can also be obtained through dietary sources such as fatty fish or fortified foods. The liver converts vitamin D to calcidiol, which is then converted to calcitriol in the kidneys when blood calcium levels are low.

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Vitamin D

Question 210

Multiple Choice

Vitamin D

A) is not synthesized by the body, so it must be obtained in the diet.
B) is synthesized in the liver, where it acts on adjacent cells.
C) is converted to calcitriol when blood calcium is high.
D) is synthesized from calcitriol.
E) is converted to calcitriol, which acts as a hormone and increases calcium absorption in the gut and kidneys.

Correct Answer: