Hair growth stages
Hair growth stages
Hair loss differs in women and men due to the different genes between the sexes and the rate of hair loss also differs between those who have given birth to a newborn and those who have not given birth due to the difference in hormones in both cases. Human hair consists of keratin, which is a special protein that is also responsible for the formation of fingernails and toenails, and human hair is an important part of its skin, and is produced through what are known as root cells, and the number of hairs in the head on average is 100,000 hairs, and its thickness and shape varies according to gender.
Growth stage
At this stage, hair cells divide very
quickly, increasing the length and density of hair, and the duration of this
stage extends from two to six years, and in other sources from two to eight
years, depending on the person’s genetic genes, and often and at any time the
percentage of hair that goes through this phase of growth Between 80% to 90%,
and some people grow their head hair very quickly because their growth stage is
a long period and others notice that their head hair does not lengthen much or
it lengthens very slowly due to the short growth stage they have, and at the
end of this stage the scalp is prepared To the next stage.
There are some factors that lead to a
reduction in the duration of the growth stage, for example, the growth phase is
short for people who follow a diet in which food calories are very limited, and
those who undergo chemotherapy, or who have given birth, suffer from this, and
because of shortness The growth stage A large amount of hair is subject to the
falling stage, so one notices that his hair falls in large quantities, and
there are people who suffer from the short growth stage and do not have to cut
their hair from time to time. As it does not last for unknown reasons, and this
condition is rare.
Transitional phase
In this stage, the hair moves from the
growth stage to the stage of rest and stability and this stage is called the
transitional stage because the blood is cut off from the hair follicles and
thus the nutrient supply stops and the hair stops growing and shrinks
gradually until it reaches a sixth of its original length, where its ends are
destroyed but do not fall out, and this stage continues. From two to three
weeks, and a maximum of four weeks.
Dormancy stage
At this stage, the hair enters a dormant state and remains so until the growth phase begins again, so the damaged hair falls out, and 10% - 15% of the hair is in this phase at the same time, and this phase lasts from two to four months, after which the growth phase begins New, where hair falls when the growth phase begins and new hairs grow, pushing the damaged hair to fall, and the rate of hair loss reaches from 50 to 100 hairs per day, and it should be noted that whole hair does not go through the same phase at the same time, and human hair does not fall once and become Bald hair to start growing again in the growth phase, but part of the hair passes in the growth phase and another part in the transition phase, while the third part is in the dormant phase, and so on.
Hair components
The hair consists of two main parts:
The root: It is located inside the skin in the pocket of my greasy hair, and at the base of the root there is the hair follicle, which is the living part of the hair that the blood vessels supply with food, and in each root, there is a sebaceous gland that releases a substance responsible for arranging the hair, and this fatty substance works to protect the hair by Surround it with a thin cover that protects it.
The stem: It is the visible part of the hair, and it consists of a group of thin fibers surrounded by a stratum corneum consisting of keratin that is secreted by the cells inside the follicle, and this layer protects the hair from external factors, and it is also affected by many things such as the types of shampoo used, the hair drying tool, And various hair dyes.
