Hair & Scalp SciencesCâu 71 / 100
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
Giải thích
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.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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