Hair

: A hair consists of two main parts: the living follicle beneath the skin and the dead shaft above it. The shaft itself has three layers:

: The hollow inner core, typically only found in thicker or coarser hair.

How to Determine Your Hair Type and Texture – OLAPLEX Inc. : A hair consists of two main parts:

"Brush your messy hair, embrace a bun, and take on the world." ―Anonymous. “Hair brings one's self-image into focus; it is vanity' Southern Living

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 "Brush your messy hair, embrace a bun, and take on the world

: Hair grows in three repeating phases: Anagen (growth, lasting 2–7 years), Catagen (transition), and Telogen (resting/shedding).

: The middle layer that provides strength, elasticity, and color through melanin. : The middle layer that provides strength, elasticity,

Each strand is a "mini-organ" composed of about 90% keratin , a tough protein also found in nails.