Hair & Scalp Sciences第 70 / 100 题
Sebum, which lubricates the hair and skin, is produced by the:
a.Sweat glands
b.Arrector pili muscle
c.Dermal papilla
d.Sebaceous (oil) glands
解析
The sebaceous glands secrete sebum, an oily substance that lubricates and protects the skin and hair. Overactivity can cause oily scalp conditions, while underactivity leads to dryness.
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