Morphology and physiology of hair.
The structure of the hair.
The hair above all have a role in physical protection of the skin: the man walking upright, the skull is the most exposed, particularly to sunlight.
The visible part of hair is biologically dead. Indeed, the living part of hair is in the follicle.
Hair is composed mainly of keratin, fibrous molecule that gives hair its strength. Keratin is also a major constituent of nails and even the hooves of animals.
The hair at an average diameter between 70 and 80 thousandths of a millimeter and is composed of different layers from the pith in the center, to peripheral scales.
The hair is rooted in a follicle, the matrix that creates and nourishes through the blood vessels.
Besides the hair, there is a small gland, the sebaceous gland that produces a slightly oily liquid called sebum to protect against external aggressions.
The hair color is given by the melanin pigment in the hair shaft, which is synthesized by specific cells: the melanocytes.
The hair fiber is composed of three main structures:
1.La cuticle, transparent covering of hair, she has small scales that fit together like tiles on a roof. It is the protective layer of hair, if it is damaged, the inside of the hair is weakened and it may rupture.
2.The cortex, consisting of "parallel rolls" containing keratin, and melanin that gives color.
3.La marrow, it is made of proteins.
Hair growth.
On average, hair contains 120 000 170 000 hair!
Hair grows in a cyclical rhythm:
A growth phase, which lasts three to seven years, during which the hair grows.
A regression phase, two to three weeks, during which the follicle no longer produces hair.
A resting phase, three to four months, during which the hair dies and falls.
Different types of hair.
The hair is different from one person to another, they have their problems and their characteristics:
1.The normal hair: his hair had no problems, no excess sebum, no film, idyllic, but rare!
2.The fine hair: it's a genetic inheritance, such as eye color. Fine hair gives the impression of being very small. In reality, a person with fine hair as many hair than others, but their subtlety makes them flat and lacks volume.
3.The hair dull: perms too aggressive, stains poorly made, hard water, make hair dull. They lack brightness.
4.The dry hair: they are rough to the touch, brittle and split ends. These abnormalities are caused by a lack of sebum due to an abnormality in sebaceous glands. The secretion of sebum, which protects the hair, is so inadequate. Most often, the hair becomes dry due to a bad treatment (unsuitable shampoo, brushing, staining, sun ...). The hair must first be rehydrated.
5.The hair "Afro" hair that is thick, curly, is fairly dense. The scalp and very dry. Hair "insults" are most vulnerable because they have very tight curls. This fragility is exacerbated by habits of hair: 13, additions, faces, hair awareness. Therefore the "pampered" with the utmost care by providing special care to feed them (an entire article devoted to this type of hair on my blog).
6.The greasy hair: it is most often an excess of sebum that causes it. Sebum has three functions: it lubricates the hair, making it waterproof and supple. It also protects against the wind, pollution ... But an annoyance, injury, hormonal imbalance can disrupt the functions of sebum. The bold hair is fragile, we must take the utmost care.
7.The Dandruff: Dandruff is caused by excessive production of dead cells that stick together to form white particles. There are two types of film:
dandruff flakes are dry, which adhere more or less hair and is usually found on the shoulders! Several causes are mentioned: stress, emotions, diet, climate, hormonal activity, fatigue, dry scalp due to the use of too aggressive.
The oily film are larger than the film because they agglomerate dry them, oil serving as glue. These films adhere to the scalp. There is also an abnormal proliferation of Malassezia furfur (fungus flora of the skin), causing irritation and inflammation of the scalp resulting in an acceleration of cell renewal and thus the formation of scales. This phenomenon is often accompanied by itching.
The dry films are most frequently and use a mild dandruff care enough to solve the problem.
The shapes of hair.
The nature of hair (curly, straight ,...) is related to the shape of the diameter of the hair, determining its cosmetic appearance, brilliance, and ability of sebum to coat the hair.
The straight hair is the brightest because they have a smooth surface for maximum reflection of light.
The colors.
Egyptians, Hindus, Greeks, Chinese, Romans, used for vegetable for more nuanced colorings.
Elder, chestnut, chamomile, walnut trees have long been used for coloring hair. Then came the era of synthetic dyes.
We distinguish:
Temporary coloring (colored deposit on the surface of the hair) that eliminated the shampoo.
The coloring process called "permanent" using oxidation dyes, which penetrate into the hair. These are the most used (80%).
Be careful not to abuse the color makes hair brittle and rough!
Hair is exposed to the same attacks the skin, they become brittle and dry to the touch of sun and water. Comb too aggressively, the act of braiding hair, stress, smoking, alcohol are harmful to hair.
It must therefore provide the specific treatment to restore their health!
Why do our hair, they are brown, blond or red?
The color of our hair depends on molecules called respectively, eumelanin (black pigment melanin) and pheomelanin (yellow pigment melanin and red). It is the mixture of the two that give color to hair.
whether eumelanin is found exclusively, our hair will be a very dark brown.
If péomélanine becomes the sole monomer, they will be red.
Mixtures more nuanced leave room for intermediate hues such as blond, light brown or dark brown ...
Small tips to have healthy hair.
1.Bien eat! Some inputs are required such as vitamins A, B, C, D, E, zinc, copper, iron, ... The hair health requires good nutrition.
2.Use care contractors that consolidate, depth and surface, weak hair.
3.Application masks repairers to feed in depth the hair fiber.
4.Rincer length hair, ending with a jet of cold water to make them more brilliant.
5.Démêler hair, always starting with the tips to avoid breakage.
6.Éviter anything that alters the keratin as untimely brushing, styling tools ill-suited, the permanent discoloration.
7.Ne not forget to regularly cut the tips of hair to revitalize it.
For hair look healthy and shine!
Our hair is naturally protected. This protection is gradually destroyed by the wind, sun, pollution, intensive styling ... Therefore, the scales differ and spoil them. The hair becomes coarse and forked. It loses its shine.
The picture is clear: if hair is dull, the hair shaft is damaged!
Action Needed:
Anticipate and enhance, protect hair from sun damage with a shampoo with UV filters (UV from altering pigments) and protective agents in color.
Maintain, use shampoos with natural plant extracts which prolong color as the sunflower. The hair will be protected and less susceptible to outside attacks.
Choose care softly, Mr. Frederick uses no synthetic dye for full respect of human hair.
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