Understanding hair structure and growth
Hair consists mostly of a protein called creatin that is produced in special cells found in the outer skin and in the nails. On average, hair consists of 51% carbon, 6% hydrogen, 17% nitrogen and 20% oxygen, but it varies from person to person.
The structure of the hairline
Hair has an onion root that is surrounded by a hair follicle. In hairs, there are no nerves and they are not provided with any blood. Therefore, one can say that hair is dead. The growth rate is as fastest as you are between 15 and 35 years, and on average hairs grow about 1 cm per month. You can usually divide the hair into three different parts: the cuticle ball, or the cover cells, which is the outer hard layer of the hairline.
The cuticle is made up of translucent, overlapping and mountainous cells that grow from the head toward the end of the hair. The scales are thin and colorless and also to protect the interlayer cortex. Cortex is the largest part of the hairline and is made up of round cells. Cortex is important for the strength and elasticity of the hair and there are also the pigments that give us our hair color.
The inner part of the hair is called medulla, or the labyrinth, and consists of round cells. People with very thin hair may in some cases lose the medulla in their hair.
A person usually has between 110,000 and 140,000 hairs on his head, but this varies greatly from person to person, especially between different parts of the world. A hair strain grows for two to eight years and its lifetime consists of three phases: Growth Phase (anagen), Transition Phase (Telogen) and Phrase (Exogenous).
The growth phase occupies the largest part. At the transitional stage, the papilla, which supplies the hairs with nutrition, begins to contract. Finally, the hair goes into the resting phase and eventually ends. The process can then start over again. Every day we lose between 50-150 hairs.
The hair follicle grows in the dermis, about 3-5 mm down the skin. The dermal papilla is the bottom part of the hair follicle. The papilla gets its nutrition through the blood vessels that are adjacent to the area. Hair strain production begins in the papillae and then grows up in the hair follicle.
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How does hair get its color and where does it happen ?
Hair currents get their color because cells called “melanocytes” produce a pigment. The pigment is called “melanin” which actually means “black”, but today scientists and dermatologists use the word melanin when they talk about hair pigments in general. An ordinary hair fiber is completely undisturbed. If we bleach a hair, the hair fiber will look white because it reflects all light.
Melanocytes are evenly spread throughout the skin and also in small concentrated collections in the hair follicles. Melanocytes respond to different stimuli and produce different amounts of melanin.
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