What portion if the hair is protrudes from the skin?

The portion of hair that protrudes from the skin is called the hair shaft. It is the visible part of the hair that extends above the skin's surface, while the root, which is embedded in the hair follicle, is not visible. The hair shaft is made up of three layers: the cuticle, cortex, and medulla. This structure is responsible for the hair's appearance, texture, and strength.