Which list correctly orders the three layers of the hair shaft from the OUTSIDE in?
Explanation
From outside to inside the hair shaft is: CUTICLE (overlapping translucent keratin scales that protect the strand and reflect light when smooth), CORTEX (the bulky middle layer containing the keratin fiber bundles, melanin pigment, and most of the side bonds; responsible for strength, elasticity, and color), and MEDULLA (the innermost honeycomb-like core, sometimes fragmentary or absent, especially in fine or blonde hair). Chemical services target the cortex but must first pass through the cuticle. Cosmetologists rely on this anatomy daily under the general competence duties at Bus. & Prof. Code §7320. Options A, B, and D scramble the order in ways the exam tests directly.
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