Here's why:
* Hair Follicles: Hair grows from structures called hair follicles located beneath the skin's surface (scalp). The base of the hair follicle contains the hair bulb, where living cells divide and multiply to create new hair.
* Growth Process: As new cells are produced in the hair bulb, they push older cells upward, causing the hair shaft to elongate and emerge from the scalp. The cells that make up the hair shaft eventually die and become keratinized, which is why we don't feel pain when we cut our hair.
* Ends of Hair: The ends of hair are the oldest part of the hair shaft. They do not contain living cells and cannot grow.
Therefore, hair growth originates from the living cells within the hair follicles at the roots, not from the ends of the hair shaft.