What is the precursor of vitamin D made in response to UV light?单项选择题

A

calcitonin

B

cholesterol

C

calcium

D

PTH

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Question at position 16 On a cloudless day, you stand outside at Noon for 15 minutes with the sun shining on your bare face. Why does your skin produce less vitamin D if you do this in the winter than in the summer?UVD radiation from the sun has to travel through more of the earth’s atmosphere to reach your skin and therefore there is less energy to convert 7-dehydrocholesterol into vitamin D.UVA radiation from the sun has to travel through more of the earth’s atmosphere to reach your skin and therefore there is less energy to convert 7-dehydrocholesterol into vitamin D.UVC radiation from the sun has to travel through more of the earth’s atmosphere to reach your skin and therefore there is less energy to convert 7-dehydrocholesterol into vitamin D.UVB radiation from the sun has to travel through more of the earth’s atmosphere to reach your skin and therefore there is less energy to convert 7-dehydrocholesterol into vitamin D.

If you stored mushrooms at room temperature for 3 days, what would you expect to happen to the vitamin D content on day 3 compared to day 1?[Fill in the blank]

Vitamin D production is stimulated by natural light and is regulated by skin melanin. Proper exposure to natural light means better:

Which nutrient is created in the skin when exposed to sunlight?

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