Here's a breakdown:
* Hair follicle: This is the structure embedded in the skin where the hair grows.
* Hair bulb: The base of the hair follicle where new hair cells are produced.
* Hair shaft: The visible part of the hair that extends from the scalp or skin surface.
* Hair root: The part of the hair embedded in the follicle.
So, when you see a strand of hair, that's the hair shaft!