Which skin process initiated by sunlight is essential for bone health?

Prepare for the VTCT Level 2 Facial and Skincare Test. Revise with flashcards and multiple choice questions, accompanied by insightful explanations. Ace your assessment with confidence!

Multiple Choice

Which skin process initiated by sunlight is essential for bone health?

Sunlight triggers the skin to produce vitamin D, which is essential for bone health. UVB rays convert a precursor in the skin, 7-dehydrocholesterol, into vitamin D3. This vitamin is then activated in the liver and kidneys to become calcitriol, the hormone that increases calcium and phosphate absorption from the gut, supporting bone mineralization. Without enough vitamin D, calcium absorption drops, weakening bones and leading to rickets in children or osteomalacia in adults. Factors like time of day, season, latitude, skin pigmentation, age, and sunscreen or clothing affect how much vitamin D you can make. The other processes listed—sensation, keratinisation, and waste removal—are not driven by sunlight in this context.

Sunlight triggers the skin to produce vitamin D, which is essential for bone health. UVB rays convert a precursor in the skin, 7-dehydrocholesterol, into vitamin D3. This vitamin is then activated in the liver and kidneys to become calcitriol, the hormone that increases calcium and phosphate absorption from the gut, supporting bone mineralization. Without enough vitamin D, calcium absorption drops, weakening bones and leading to rickets in children or osteomalacia in adults. Factors like time of day, season, latitude, skin pigmentation, age, and sunscreen or clothing affect how much vitamin D you can make. The other processes listed—sensation, keratinisation, and waste removal—are not driven by sunlight in this context.

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