Mostrando las entradas con la etiqueta anagen. Mostrar todas las entradas
Mostrando las entradas con la etiqueta anagen. Mostrar todas las entradas

Dihydrotestosterone

Dihydrotestosterone or DHT as it is known is a very potent hormone in the humane body. This hormone DHT is responsible for giving man his male characteristics when he is just a fetus in his mother's womb. It is during the sixth week of pregnancy that DHT stimulates the growth of the male sex organs and stems the growth of the female genitalia.


Dihydrotestosterone or DHT as it is known is a very potent hormone in the humane body. This hormone DHT is responsible for giving man his male characteristics when he is just a fetus in his mother's womb. To put things in the simplest of ways, all of us start out in the womb as females, a status decided on by nature. It is during the sixth week of pregnancy that DHT begins to form in the fetus by testosterone, the male hormone, combining with an enzyme called 5 alpha reductase. It is this DHT that stimulates the growth of the male sex organs and stems the growth of the female genitalia. Now just imaging what would happen if this DHT were to be a scarce commodity during this crucial stage of sex determination in the fetus!
The anomalies of DHT deficiency



The result of a deficiency of Dihydrotestosterone in the fetus stage will result in abnormal formation of male sex organs and will produce an infant which will be neither this way nor that, and if the male genitalia are fully formed then there may just be a lack of libido and probably complete sterility. Let us understand how this happens. Because males with a deficiency of Dihydrotestosterone are born with ambiguous genitalia, this condition is better known as 'Pseudohermaphroditism' the clinical abnormalities of this condition will range from infertility to underdeveloped male with 'Hypospadias' to predominantly developed female external genitalia. The uterus and fallopian tubes in this case are absent because of the normal secretion of the 'müllerian-inhibiting' factor and the testes are intact. Male internal ducts are present but terminate in a blind Pseudovaginal pouch or terminate on the perineum.


How it happens


5-alpha-reductase, the enzyme that converts testosterone to Dihydrotestosterone or DHT, is the cause of this very disturbing disorder. The conversion to DHT involves hydroxylation at the 5 carbon position of the 'A' ring of the steroid molecule. This change flattens the shape of DHT, permitting it to fit perfectly into the androgen receptor in a way that the hormone testosterone cannot. In this way, DHT is bound selectively to the androgen receptors in genital skin and fibroblasts, making its action necessary for the development of normal male genital anatomy in the fetus.


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Cycle Of Hair Growth And Information about Follicles.

Summary:
Hair Grows At a rate of 1cm. per month and grow in a cycle consisting of 3 steps.
The Follicles produce the hair and are replenished through out the life of the human being. The time of phases of growth of the hair is determined genetically.


At any Stage of our life, only 10% of hair is in resting phase. They Fall off in 2-3 months and the new hair grows in a total time of 2-6 years. About 90% of the hair grows on our scalp at a time and They grow at a rate of 1 cm. per month.
Normally hair lasts for two to four years in men and four to six years in Women.

    Hair Internal Structure : Deep Inside The hair follicle, the hair forms inside a hair bulb and protrube and grow outside.
Any Method of hair improvements like shampooing, conditioning, cutting, sun exposure does not effect the rate of grwth of the hair.

There Are 3 phases of hair growth - 
1. Anagen which takes a time of about 1000 days or 3 years.
2. Catagen lasting for 10 days.
3. Tologen for nearly 3 months.

    Anagen includes the start of growth of hair and Tologen is the end i.e. trhe shedding phase of hair. The Hair bulb goes on coming outside from the start to the shedding phase. Hair groth is effected by the seasonal changes, i.e. hair grows more quicker in winter than in summer as a result of the seasonal change. In the Catagen phase, Hair growth is stopped for a small time and no pigment is produced at this time.

    The time of Anagen Phase is usually fixed and and is determined genetically and is also responsible for the length of the hair. The no. of Hair Follicles in a human head counts approximately 100,000. Each Follicle produces hair for about 20 times in the lifetime. In a new born baby, the hair follicles grow hair in a Unison, i.e. all at a same time but as time passes, the follicles produce hairs at different times.

      If a hair is Plucked from the head, the follicle is not ruptured but it starts to produce a new hair. As age increases, the shedding of follicles is evidently seen in most of the people in the top of the head and also in the forehead. The Hair does not grow in a definite straight manner but makes the follicle to stand in some constant angle. Depending on this angle, the Hair are always set to lie. The Stream is usually in a twisted manner but it is then influenced by the way of combing of hair by people.
Finally, Hair grows at a slow rate, so utmost care is needed to prevent them from shedding.


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