Hair: An Extension of Our Nails Made of Keratin

Introduction

Hair and nails are both integral parts of our body that are composed of the same substance called keratin. Keratin is a fibrous structural protein that forms the foundation of various external body parts, providing strength, protection, and elasticity.

The Composition of Hair and Nails

Our hair and nails are primarily made up of dead, hardened cells rich in keratin protein. Keratin is a durable and insoluble protein that is also found in the outer layer of our skin and in other parts of the body, such as our teeth and feathers in animals.

The process of hair growth begins within specialized cells located at the base of our hair follicles, known as the hair bulb. These cells divide and undergo transformation, gradually pushing the older cells upward. As they move closer to the surface, these cells lose their nucleus, become keratinized, and eventually turn into a hardened structure we recognize as hair.

Similarly, our nails are formed by keratin-producing cells located underneath the nail bed. The keratin cells in our nails continually grow and harden, resulting in the visible part of the nail that we see. The rate of nail growth varies from person to person, but on average, nails grow about 0.1 millimeter per day.

Hair and Nails: A Protective Covering

Apart from their aesthetic value, both hair and nails serve as protective coverings for the underlying tissues. Hair shields our scalp from harmful ultraviolet (UV) radiation, reducing the risk of sunburn and preventing the excessive loss of moisture. Additionally, hair on our body acts as a barrier, helping to regulate body temperature and providing protection from external elements, such as dust and debris.

Similarly, nails act as a protective barrier for the tips of our fingers and toes. They provide support, improve our gripping abilities, and shield the sensitive nail bed from potential injuries. For instance, if we accidentally hit our fingertips, the nails absorb the impact and prevent direct damage to the underlying tissues.

Conclusion

In conclusion, it is fascinating to recognize that the hair on our heads and the nails on our fingers and toes share a common composition. Keratin, a sturdy protein, forms the foundation of both hair and nails, providing them with strength, protection, and elasticity. Understanding the composition and importance of these external body parts helps us appreciate their role in our overall well-being.

Source: Dr. Standley - Human Hair