As an expert in the field of biology, I can provide a detailed explanation about the composition of hair and its growth process. Hair is a fascinating structure that serves multiple purposes, including protection, insulation, and even social signaling in some species. Let's delve into the biological aspects of hair to answer your question.
Hair is primarily composed of a protein called keratin, which is also found in nails and the outer layer of our skin. The growth of hair occurs in three phases: the anagen (growth) phase, the catagen (transitional) phase, and the telogen (resting) phase.

During the anagen phase, hair follicles are active, and the cells at the base of the follicle divide rapidly. The tiny blood vessels at the base of every follicle, as you mentioned, play a crucial role in this process. They provide the necessary nutrients and oxygen to the hair root, which is essential for its growth. The cells in this area are indeed alive and metabolically active.

However, as the hair strand moves up and away from the follicle towards the skin's surface, the cells within the strand undergo a process called keratinization. This is a process where cells lose their nuclei and other cellular contents, becoming filled with keratin instead. As a result, these cells are no longer living and are considered dead.

The hair you see on your body, whether it's on your head, arms, or legs, is made up of these dead cells. They are tightly packed together to form a strong, protective structure. The outermost layer of the hair, known as the cuticle, is made up of overlapping, dead keratinized cells that serve to protect the inner layers of the hair.

It's important to note that while the cells that make up the hair shaft are dead, the hair follicle itself is a living tissue. It contains living cells that continue to produce new hair cells, ensuring the continuous growth of hair.

In summary, the answer to your question is that the hair you can see and touch is indeed made up of dead cells. However, the process of hair growth is a complex and dynamic one, involving both living and dead cells at different stages. The living cells at the base of the hair follicle are responsible for the growth and development of the hair, while the dead cells that make up the majority of the hair shaft provide the structure and protection we associate with hair.

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Tiny blood vessels at the base of every follicle feed the hair root to keep it growing. But once the hair is at the skin's surface, the cells within the strand of hair aren't alive anymore. The hair you see on every part of your body contains dead cells.read more >>