Multiple Choice
Which of the following skin features should be assessed as part of a comprehensive skin examination?
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5. Integumentary System
Introduction to the Integumentary System
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Which of the following organs is involved in the synthesis of vitamin D?
A
Liver
B
Kidney
C
Skin
D
Pancreas
Verified step by step guidance1
Understand the role of each organ in the synthesis of vitamin D. The skin, liver, and kidneys are involved in this process.
Recognize that the synthesis of vitamin D begins in the skin. When the skin is exposed to sunlight, specifically UVB radiation, it converts 7-dehydrocholesterol to previtamin D3.
Note that previtamin D3 is then converted to vitamin D3 (cholecalciferol) in the skin through a heat-dependent process.
Understand that the liver is the next organ involved, where vitamin D3 is hydroxylated to form 25-hydroxyvitamin D (calcidiol).
Finally, the kidneys convert 25-hydroxyvitamin D to the active form, 1,25-dihydroxyvitamin D (calcitriol), through another hydroxylation process.
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