Hair is simple in structure, but has important functions in social functioning. Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. Hair is constituted for a percentage between 65% and 95% of solid proteins such as keratin and for the rest of water, lipids, pigments and trace elements. Melanin is also another solid protein that gives color to the hair. Keratin is composed of amino acid called lysine and cystine. Aron followed by zinc, magnesium and cooper are other important substances in the life of the hair and all take part of the melanin process formation. They look like fluff in the fourth month of their fetal life. They grow to a speed of around 0,3 mm a day (1 cm for month). The hair has a circular growth of 2 to 6 years even if there are documented cycles of over 10 years. The hair falls and is replaced at the end of each cycle.
The cycle of the hair is formed by the succession of three phases:
Even the hair length is very variable and rarely reaches the meter. Hair is the only part of the body that keeps on growing during its life, together with nails and shave. The Hair follicles have androgen receptors, and other enzymes responsible for their conversion into other androgenic hormones in the scalp: Androgen receptors contained in the women’s follicles are approximately 40% less than in men.
The hair is divided into three parts:
- The cuticle: is the external layer of the hair and it is constituted by cells that have to protect the inside of the hair from possible chemical damages, physical and also from mechanical traumas.
- The bark: is the intermediary layer of the hair and is also the most abundant. It has a melanin pigment and it is the layer in which most of the chemical treatments operate. It is responsible for the main physical properties of the hair such as resistance and elasticity.
- The marrow: is the central part of the hair. It is very abundant in animals and it is 50% of the mass of its hair. However, it is very scarce and sometimes it is absent in the human hair. Its function is not well known and it is probably related to the thermoregulation.
* Thermoregulation is a process that allows your body to maintain its core internal temperature.
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