3 years ago

"Upon exposure to ultraviolet radiation, cells in which two epidermal layers convert a steroid into vitamin D3?"

1 answer:

3 0

Answer:

Vitamin D3 is synthesized in keratinocytes of the two epidarmal layers namely stratum basale (bottom layer) and stratum spinosum.

Explanation:

In the two epidermal layers of the skin namely stratum basale and stratum spinosum, 7-dehydrocholesterol (pro-vitamin D3) is converted to vitamin D3. This process takes place in the presence of ultravoilet radiations. Briefly, upon exposure, the pro-vitamin D3 is photolyzed to pre-vitamin D3. The pre-vitamin D3 then isomerized to form vitamin D3.

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