Hair & Scalp Sciences第 71 / 100 题
Hair elasticity, the ability of hair to stretch and return, is determined mainly by bonds in the:
a.Cortex
b.Cuticle
c.Medulla
d.Sebaceous gland
解析
The cortex contains the hydrogen and disulfide bonds that give hair its strength and elasticity. Damaged cortex bonds leave hair weak and prone to breakage.
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