Due to the increasing dryness of her skin in recent years, a 70-year-old woman has needed to reduce the number of baths that she takes. Which of the following factors has resulted in this age-related change in skin function?
A) Slower keratinization
B) Changes in sebaceous secretions
C) Dehydration of epidermal cells
D) Increased production of bile salts
Ans: B
Feedback:
The effects of aging on skin dryness include a change in the composition of sebaceous gland secretions and a decrease in the secretion of moisture from the sweat glands. Changes in the composition of keratinocytes and the process of keratinization do not account for the drier skin that accompanies aging. Deposition of bile salts on the skin surface causes pruritus and dry skin, but this is a pathologic process rather than an age-related change.
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