What Is Hair and How Does It Grow?


Hair is an important part of the human body. It provides warmth, protection, camouflage, and offensive defense. There are many types of hair. These include coily, straight, and fine. The length and thickness of the hair can vary depending on the culture and the location.

The most common type of hair is straight, although it can also be curly or wavy. When held up to the light, a strand of hair may appear translucent. However, these strands are more easily identifiable when they are shed. In addition, it is possible to alter the color and pattern of the hair. If you have different-colored or thin hair, try experimenting with products to see what works best for you.

Hair is composed of keratin, which is a strong, protein-based substance. This fibrous protein protects the hair from breakage and damages caused by scratches and other physical stress. Keratin also serves as a lubricant for the hair.

Hair can grow from follicles on the skin, or in the scalp. In the scalp, hair is attached to a sebaceous gland. Sebaceous glands produce oil that moisturizes the scalp and makes the hair shiny and waterproof.

As hair grows, new cells replace old ones. The cellular growth is a continuous, cyclic process. The duration of each phase depends on the age and nutritional status of the person.

During the anagen phase, hair is actively growing. The follicle is located in the junction of the deep dermis and hypodermis. An artery feeds the root of the hair. A small vessel penetrates the hair shaft to ensure a steady blood supply.

The follicle also produces a nourishing part called the cuticle. The cuticle is a thin, protective layer made of scale-like cells. Each cuticle is 60 micrometers long and six micrometers wide. The inner part of the cuticle contains macrofibrils and is nourished by intercellular cement, a lipid-rich substance.

Once the follicle is mature, it goes through various stages of growth and shedding. Growth phases depend on age, nutrition, and hormonal status. The follicle is also shaped by the cells inside it. For example, an oval follicle will produce curlier hair.

In addition to being a source of warmth and camouflage, the hair also plays an important role in non-verbal communication. Eyebrows, eyelashes, and other hairs are important parts of the face. They help keep eyes clean, protect them from dust, sweat, and other particles, and reduce the amount of light that enters the eye.

There are four main types of hair: curly, straight, coarse, and fine. Hair is made up of 95% keratin. Hair can be dark, light, or red. People with darker complexions tend to have black or dark brown hair. Similarly, people with lighter skin often have hair that is brown or blonde.

Different cultures have different hair care routines. For example, in the 1920s, bobbed hair was very popular among flappers and female art students. Some religious groups follow a specific ritual or observance for the hair.