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Facts about hair
Hair covers all parts of the human body at varying rates, except for the palms of the hands, the soles of the feet and the lips. The hair appears more clearly on the scalp and face including the nose and ears in some cases, armpit, pubic area, chest and legs.
Facts about hair follicles:
Hair follicles are the part from which hair growth starts and is a small bump in the form of a cup hidden in the depths of the fatty layer of the scalp. The hair follicles are well equipped with blood vessels. Blood flows through the growth zone and the hair follicle temperature is almost equal to normal body temperature and is not affected by hot or cold water
Hair growth in animals For example, hair grows at varying rates depending on the amount of exposure to natural light, which changes continuously depending on the seasons of the year, we find that hair grows faster in the winter when the days are short. It is assumed that the nature of human hair is similar to that, where hair grows slightly faster in the winter. The hair follicle consists of two divided areas, hair root and hair shaft.
How many hairs in the human head?
♦ On average, each person's head contains about 100,000 hair follicles. Some people may have over 150,000 hair follicles or more.
♦ In the head of the child, there are about 1100 bulbs per square centimeter, and the number of hair follicles by the age of 25 years to become about 600, but depends on the number of physical condition of the person.
♦ In the 30- to 50-year-olds, the number of hair follicles decreases more than 250-300. After this phase begins the slight hair loss with age.
♦ Each hair follicle develops about 20 new hairs in life. Each new hair grows for several years, and can be longer than one meter.
♦ Each hair eventually falls off and is replaced with a new hair.
Root of hair
The root of the hair is inside the hair follicle. It is an active growth cell, which eventually produces a thin, long cylinder, the hair shaft, and the process of producing new cells at a constant rate at the bottom of the root of the hair. As these new cells grow and develop individually, they push the previously formed cells up. When the cells reach the top of the hair root, they begin to change, and become six cylindrical layers, each within the other. Thus, the three inner layers of cells form the actual hair. The three outer layers form the lining of the hair follicle, the inner root casing. The hair dye is produced by special cells in the hair called the melanin pigment. The cells are known as the pigment cells, and while the hair grows inside the hair follicle, the melanin is moved upwards in the inner part Of hair.
The central area of the hair follicle:
The central area of the hair follicle is the area where the growth cells die and harden to form what we call hair. As the lower cells continue to divide, push up, the hair grows to the top, and finally comes out of the skin. It now consists of a mixture of different forms of special hair protein known as keratin. Some of these keratins contain a high sulfur content, some of which contain much less sulfur plays an important role in hair style, especially when using cosmetic treatments.
What is the hair stem
Is the part of the hair that can be seen above the scalp. It is composed primarily of dead cells that have turned into keratinates and materials for cohesion, along with low amounts of water, and the ends of hair are lubricated by natural oil (sebum) produced by the sebaceous glands hair follicle. The amount of sebum produced by the sebaceous glands is often determined by your genetic genes. However, sebaceous glands of men and women tend to produce more fatty substances at higher levels of their hormones (androgens). In many adolescents, there is a huge increase in levels of the hormone, which in turn leads to the production of fatty substances that we referred to. Which results in tendencies for fatty hair, which is very common among many young people. The good news is that most of them get rid of it.
Installation of hair stem
The glossy glossy hair has a much more complex structure than one might imagine. Comparing the hair with the tree, where the full moisturization lies in the middle of the tree, behind the protective layer of external bark. If the hair is in good condition, the hair as a whole is in good condition, but if the bark is stripped and the central part of the hair is removed, the hair may be cut. The central part of the hair is called the cortex, which forms most of the hair shaft. It gives the hair special qualities such as flexibility and wrinkle. The crust contains a large amount of keratin strands extended hair length. These creatine fibers are made up of keratines that contain a small amount of sulfur and these fibers are compressed to form a larger bundle of fibers. Which are combined together by sulfur-rich keratinates and intercellular tissue. The resulting mixture is a combination of fibers and interstellar tissue that is very strong and resists tensile and other forms of stress such as sprains, as does the resin and fiberglass mixture that is used to build many boats.