Skin dryness is a symptom of aging and it is a result of which of the following?

Question

BlackTom AI · Accepted Answer

Diminished secretion of sweat and oil glands reduces the skin’s surface lipids and moisture, so this is the direct cause of age-related skin dryness.

1. Relevant knowledge points and concepts
- Sebaceous glands produce sebum (skin oils) that form a lipid film preventing excessive transepidermal water loss (TEWL).
- Eccrine sweat glands contribute water and help maintain the skin’s moisture and acid mantle.
- Normal aging reduces activity of both sebaceous and sweat glands, lowering surface lipids and hydration.
- Other aging changes (loss of collagen/elastin, photoaging, reduced vitamin D synthesis) affect elasticity, wrinkles, and systemic vitamin D status but do not primarily produce dryness.

2. Step-by-step reasoning
- With advancing age, glandular output declines: sebaceous gland sebum decreases and eccrine sweat output is reduced.
- Less sebum = thinner lipid barrier on the stratum corneum → increased TEWL.
- Less sweat = less surface moisture and reduced function of the acid mantle → impaired hydration.
- Increased TEWL and reduced surface lipids produce clinically noticeable skin dryness, roughness, and scaling.

3. Intermediate physiological steps (explicit)
- Aging → ↓ sebaceous secretion and ↓ eccrine secretion.
- ↓ Surface lipids + ↓ surface water → ↑ transepidermal water loss.
- ↑ TEWL → decreased skin hydration → dry, flaky skin.

4. Why the correct answer is correct
- Option b directly identifies the decline in sweat and oil (sebum) production, which is the mechanistic cause of reduced skin hydration in aging. This explains the symptom of dryness most directly.

5. Why the other options are incorrect
- a. Inadequate vitamin D synthesis relates to systemic vitamin D deficiency, not to skin surface hydration.
- c. Damage to elastin from environmental factors (photoaging) causes wrinkling and leathery texture, not primary dryness.
- d. Loss of connective tissue elasticity leads to sagging/wrinkles, not the moisture loss that causes dryness.

6. Conclusion
- Therefore, the correct answer is b. Diminished secretion of sweat an oil glands, which matches the provided answer.

Skin dryness is a symptom of aging and it is a result of which of the following?单项选择题

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