Here's how it works:
1. The Hair Bulb: The base of the hair follicle, called the hair bulb, contains a group of cells called the hair matrix. This is where new hair cells are produced.
2. Cell Division: The cells in the hair matrix constantly divide and push older cells upward. As these cells move up, they become filled with a protein called keratin.
3. Keratinization: The keratin fills the cells, making them tough and waterproof. This process is called keratinization.
4. Hair Shaft: The keratinized cells form the hair shaft, the part of the hair we can see.
5. Growth and Cycle: The hair follicle goes through cycles of growth, rest, and shedding. The length of these cycles determines how long our hair grows.
So, in short, the hair follicle is the factory that produces hair, and the hair matrix is the team of workers that builds it.