: The middle layer that provides strength, elasticity, and color through melanin.
How to Determine Your Hair Type and Texture – OLAPLEX Inc. : The middle layer that provides strength, elasticity,
: The outer protective "armor" made of overlapping scales . a marker of cultural identity
Hair is a complex biological structure that serves as a powerful medium for self-expression , a marker of cultural identity, and a functional protective barrier for the human body. The Biology of Hair lasting 2–7 years)
: Hair grows in three repeating phases: Anagen (growth, lasting 2–7 years), Catagen (transition), and Telogen (resting/shedding).