Multiple Choice
Which gland secretes melatonin?
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16. The Endocrine System
Introduction to the Endocrine System
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Which of the following organs is responsible for the synthesis of Vitamin D?
A
Skin
B
Kidney
C
Pancreas
D
Liver
Verified step by step guidance1
Understand that Vitamin D synthesis involves multiple organs, but it begins in the skin.
Recognize that the skin is responsible for the initial step in Vitamin D synthesis, where it converts 7-dehydrocholesterol to previtamin D3 upon exposure to UVB radiation from sunlight.
Note that the previtamin D3 is then converted to vitamin D3 (cholecalciferol) in the skin.
Acknowledge that the liver and kidneys are involved in further processing of Vitamin D3, but the synthesis starts in the skin.
Conclude that the organ responsible for the synthesis of Vitamin D is the skin, as it initiates the process.
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