Hair & Scalp SciencesPregunta 58 de 100
The three main layers of the hair shaft from outside to inside are:
a.Bulb, papilla, follicle
b.Epidermis, dermis, subcutis
c.Root, shaft, tip
d.Cuticle, cortex, medulla
Explicación
The outer cuticle protects the strand, the middle cortex gives strength, elasticity, and holds pigment, and the innermost medulla is the core. Most chemical services act on the cuticle and cortex.
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