Why does sebum production significantly decrease as humans age, leading to increased skin dryness?

💡 Explanation

Sebum production diminishes with age primarily because of sebaceous gland atrophy and reduced androgen levels, because androgens stimulate sebum production. Therefore, the skin becomes drier; rather than increased shedding or melanocyte changes being the primary cause.

• What distinguishes the immune response to a vaccine with an adjuvant compared to a vaccine without an adjuvant?
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• If an adjuvant is omitted from a vaccine administered to a patient, which consequence follows regarding B-cell response?
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