Knowing Facts Questionnaire hair

Knowing Facts Questionnaire hair
What part of the hair, what does it do? How to grow hair, and why the loss? Why is there hair straight, wavy, curly, black, blond, brown, red? All will be explained one by one.

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Human hair, as we always called that grows on the head. Indeed, the board also includes everything in the body. So starting from the head, eyebrows, nose, ears, mustache, beard, sideburns, chest, hands, feet remain until called hair. Indeed, naming 'feathers' on parts besides hair is common, then there is nothing wrong with mentioning it. However, the cells that make up the 'feathers' on the nose, eyes, hands, chest, legs, similar to the cells of the hair on the head. Ok, scientifically, we call all of them with her hair.

Well, the hair on the entire body is divided into two major groups, namely:

1. Hair terminal
Hair terminal hair is coarse, thick, long, and contains a lot of pigment. There on the head, eyebrows, eyelashes, armpits, and genitals.

2. Hair Velus
It is a fine hair, short, and contains little pigment. There is throughout the body such as arms, chest, legs, except the palms of the hands and feet of course.


Functions hair

God created human hair with a very useful function. Besides hair now play an aesthetics (making us more stylish with a particular hairstyle), also serves as health.

The hair on the head keep us warm. Hair on the nose, ears and around the eyes to protect the organ from dust and other particles. Eyebrows and eyelashes are also protects the eyes by reducing the indirect light that hits our blind senses. Hair on the body in addition to making more warm, also the pads that protect the body from injury.


Part hair

In biology, the board consists of three main parts: the hair, the hair shaft and hair root.

End of the hair is shaped tapered portion located on the end of the hair. Then the hair shaft is the hair that are out of the skin in the form of fine threads, composed of keratin or horn cells.

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Hair root is the part contained in the cuticle. It consists of follicles, bulbus (hair bulb), papillae, blood vessels, oil glands, sweat glands, and hair pigment. The follicle is a line that resembles a hair follicle and contribute to protecting the hair bud.

While the roots of bulbus is a bloated and contains active cells that form the hair follicle at the base. Point to absorb air and dirt and sebum that has accumulated.

Papilla is a place to make stem cells and hair cells of melanin pigment that determines the color of the hair. Follicular papilla in the bottom, so it is also in charge of receiving nutrients from the follicle.

When the new hair cells to grow and multiply, will produce keratin to harden the structure. When this is the hair grow long, and the cells are driven out of the follicle and appear on the surface of the hair shaft. Blood vessels that are at the root of the hair is then supply nutrients to the cells of the epidermis to keep growing.

Hair is known to grow faster in the hot weather and grew more slowly during the night. According to the study, each strand of hair to grow over 6 mm in 1 month and will continue to grow up to 6 years. Furthermore, the hair will fall out by itself.

However, the above conditions may occur in hair growth 'normal'. If taken care of, it could be the hair will continue to grow long like some people who set records with long hair up to many meters.

Layer on the hair.
Similar to skin, hair base material is keratin protein fibers made by keratinocytes in the epidermis (outer skin layer). Each strand of hair shaft consists of a complex combination of protein compounds which are further divided into three:

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1. Cuticle
Hair also called membranes. The outer layer is thin and colorless that is fighting to protect the core of the fibrous protein keratin is always awake. The cuticle has a closely related protein as a defense against damage.

The use of excessive chemicals on the hair can damage the cuticle layer, which eventually could no longer protect the body from damage. That's why, as much as possible to do the right hair care so as not to damage the cuticle.

2. The cortex
Cortex or the scalp is between cuticle and medulla. Consisting of a combination of microfilaments, the fine threads or fibrils are highly structured. This thick layer of cortex contains pigment melanin - a substance that gives color to the hair.

Of the pigment melanin in the cortex is what makes a person can have black hair, blond, red, brown. Blond hair, this happens due to the low amount of melanin in the cortex this.

3. Medulla
The spinal cord is also called hair. It is the innermost layer of a substance formed by the horns in the form of woven with air-filled cavities. This coating can reflect light.

In this layer also form the basis of straight or curly hair. In straight hair, cross melintangnya round or oval, and wavy on one side. While on curly hair, melintangnya sectional shape of uncertainty, sometimes shaped like a kidney.


How does hair grow?

All cells in the body, including the hair cell, a cycle of growing, not growing, and akhirnyat dead. In the mean hair cell loss.

As mentioned above, the process of hair growth begins with the formation of new cells in the hair follicles. Then these cells are pushed to the outside and into the hair shaft. When grown outside, these cells stop absorbing nutrients and begin to produce keratin. This process is called 'keratinization'. At this, the hair cells were dead and with keratin to form the hair shaft.

There are three phases of hair growth are:

1. Anagen phase
On the scalp, there are about 100,000 strands of hair and most are still in the growth phase. Hair is in this phase for 2-6 years (varies in individuals genetically).

2. Phase katagen
Anagen phase followed by a phase katagen. Ie, the phase transition occurs in which the hair follicle regression, reduction in the length and volume of hair. This phase applies approximately 2-3 weeks.

3. Telogen phase
This phase is the resting phase of the hair cycle, lasting about 3 months. And ends with threshing and shoot formation of new hair. Hair loss that occurs in the normal threshold is 75-100 strands of hair.

Normal scalp has about 90% of hair in the anagen phase and 10% of hair in the telogen phase.


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Why is there a gray hair?

Hair can be bleached or we call 'gray' because in old age, the pigment melanin in the hair is no longer formed.

How to treat hair good? Will be discussed next time, yeah ...





From various sources (special credit: Kartini)

Knowing Facts Questionnaire hair