Yes, keratin is made up of dead cells. The cells that make up hair, nails, and the outer layer of skin are filled with keratin, a protein that gives these tissues their strength and structure. As these cells mature and move away from the source of nutrients, they die and become filled with keratin. This process is called keratinization.
For example, hair is produced by cells in the hair follicle. As new cells are produced, they push older cells upwards, away from the follicle. These older cells die and become filled with keratin, forming the hair shaft that we see.
Similarly, nail cells are produced at the base of the nail bed. As new cells are created, they push the older cells forward, causing the nail to grow. These older cells die and become filled with keratin, forming the nail plate.
This process of cell death and keratinization is essential for the formation of strong and durable tissues like hair, nails, and skin.
