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سحابة الكلمات الدلالية


Skin, Hair, and Nails

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Skin, Hair, and Nails

مُساهمة من طرف Admin في 4/1/2011, 7:17 pm




Skin, Hair, and Nails



About Skin, Hair and Nails




Skin is our largest organ. If the skin of a typical
150-pound (68-kilogram) adult male were stretched out flat, it would
cover about 2 square yards (1.7 square meters) and weigh about 9 pounds
(4 kilograms). Our skin protects the network of muscles, bones, nerves,
blood vessels, and everything else inside our bodies. Our eyelids have
the thinnest skin, the soles of our feet the thickest.

Hair




is actually a modified type of skin. Hair grows everywhere on the human
body except the palms of the hands, soles of the feet, eyelids, and
lips. Hair grows more quickly in summer than winter, and more slowly at
night than during the day.


Like hair, nails are a type of modified skin. Nails
protect the sensitive tips of fingers and toes. Human nails aren't
necessary for living, but they do provide support for the tips of the
fingers and toes, protect them from injury, and aid in picking up small
objects. Without them, we'd have a hard time scratching an itch or
untying a knot. Nails can be an indicator of a person's general health,
and illness often affects their growth.
Skin Basics




Skin is essential in many ways. It forms a barrier that prevents
harmful substances and microorganisms from entering the body. It
protects body tissues against injury. It also controls the loss of
life-sustaining fluids like blood and water, helps regulate body
temperature through perspiration, and protects from the sun's damaging
ultraviolet rays.


Without the nerve cells in skin, people couldn't feel warmth, cold,
or other sensations. For instance, goosebumps form when the erector pili
muscles contract to make hairs on the skin stand up straight when
someone is cold or frightened — the blood vessels keep the body from
losing heat by narrowing as much as possible and keeping the warm blood
away from the skin's surface, offering insulation and protection.


Every square inch of skin contains thousands of cells and hundreds of
sweat glands, oil glands, nerve endings, and blood vessels. Skin is
made up of three layers: the epidermis, dermis, and the subcutaneous tissue.


The upper layer of our skin, the epidermis, is the tough, protective
outer layer. It's about as thick as a sheet of paper over most parts of
the body. The epidermis has four layers of cells that are constantly
flaking off and being renewed. In these four layers are three special
types of cells:




* Melanocytes produce melanin, the pigment that gives
skin its color. All people have roughly the same number of melanocytes;
those of dark-skinned people produce more melanin. Exposure to sunlight
increases the production of melanin, which is why people get suntanned
or freckled.
* Keratinocytes produce keratin, a type of protein that is a basic
component of hair, skin, nails, and helps create an intact barrier.
* Langerhans cells help protect the body against infection.




Because the cells in the epidermis are completely replaced about every 28 days, cuts and scrapes heal quickly.


Below the epidermis is the next layer of our skin, the dermis, which
is made up of blood vessels, nerve endings, and connective tissue. The
dermis nourishes the epidermis. Two types of fibers in the dermis —
collagen and elastin — help the skin stretch when we bend and reposition
itself when we straighten up. Collagen is strong and hard to stretch,
and elastin, as its name suggests, is elastic. In older people, some of
the elastin-containing fibers degenerate, which is one reason why the
skin looks wrinkled.


The dermis also contains a person's sebaceous glands.
These glands, which surround and empty into hair follicles and pores,
produce the oil sebum that lubricates the skin and hair. Sebaceous
glands are found mostly in the skin on the face, upper back, shoulders,
and chest.


Most of the time, the sebaceous glands make the right amount of
sebum. As a person's body begins to mature and develop during the
teenage years, though, hormones stimulate the sebaceous glands to make
more sebum. When pores become clogged by too much sebum and too many
dead skin cells, this contributes to acne. Later in life, these glands
produce less sebum, which contributes to dry skin as people age.


The bottom layer of our skin, the subcutaneous tissue,
is made up of connective tissue, sweat glands, blood vessels, and cells
that store fat. This layer helps protect the body from blows and other
injuries and helps it hold in body heat.



There are two types of sweat glands. The eccrine glands
are found everywhere, although they're mostly in the forehead, palms,
and soles of the feet. By producing sweat, these glands help regulate
body temperature, and waste products are excreted through them.


The apocrine glands develop at puberty and are
concentrated in the armpits and pubic region. The sweat from the
apocrine glands is thicker than that produced by the eccrine glands.
Although this sweat doesn't smell, when it mixes with bacteria on the
skin's surface, it can cause body odor. A normal, healthy adult secretes
about 1 pint (about half a liter) of sweat daily, but this may be
increased by physical activity, fever, or a hot environment.
Hair Basics




The hair on our heads isn't just there for looks. It keeps us warm by
preserving heat. The hair in the nose, ears, and around the eyes
protects these sensitive areas from dust and other small particles.
Eyebrows and eyelashes protect eyes by decreasing the amount of light
and particles that go into them. The fine hair that covers the body
provides warmth and protects the skin. Hair also cushions the body
against injury.


Human hair consists of the hair shaft, which projects from the skin's
surface, and the root, a soft thickened bulb at the base of the hair
embedded in the skin. The root ends in the hair bulb, which sits in a
sac-like pit in the skin called the follicle, from which the hair grows.


At the bottom of the follicle is the papilla, where hair growth
actually takes place. The papilla contains an artery that nourishes the
root of the hair. As cells multiply and produce keratin to harden the
structure, they're pushed up the follicle and through the skin's surface
as
a shaft of hair. Each hair has three layers: the medulla at the center,
which is soft; the cortex, which surrounds the medulla and is the main
part of the hair; and the cuticle, the hard outer layer that protects
the shaft.


Hair grows by forming new cells at the base of the root. These cells
multiply to form a rod of tissue in the skin. The rods of cells move
upward through the skin as new cells form beneath them. As they move up,
they're cut off from their supply of nourishment and start to form a
hard
protein called keratin in a process called keratinization. As this
process occurs, the hair cells die. The dead cells and keratin form the
shaft of the hair.


Each hair grows about ¼ inch (about 6 millimeters) every month and
keeps on growing for up to 6 years. The hair then falls out and another
grows in its place. The length of a person's hair depends on the length
of the growing phase of the follicle. Follicles are active for 2 to 6
years; they rest for about 3 months after that. A person becomes bald if
the scalp follicles become inactive and no longer produce new hair.
Thick hair grows out of large follicles; narrow follicles produce thin
hair.


The color of a person's hair is determined by the amount and
distribution of melanin in the cortex of each hair (the same melanin
that's found in the epidermis). Hair also contains a yellow-red pigment;
people who have blonde or red hair have only a small amount of melanin
in their hair. Hair becomes gray when people age because pigment no
longer forms.
Nail Basics




Nails grow out of deep folds in the skin of the fingers and toes. As
epidermal cells below the nail root move up to the surface of the skin,
they increase in number, and those closest to the nail root become
flattened and pressed tightly together. Each cell is transformed into a
thin plate; these plates are piled in layers to form the nail. As with
hair, nails are formed by keratinization. When the nail cells
accumulate, the nail is pushed forward.


The skin below the nail is called the matrix. The larger part of the
nail, the nail plate, looks pink because of the network of tiny blood
vessels in the underlying dermis. The whitish crescent-shaped area at
the base of the nail is called the lunula.


Fingernails grow about three or four times as quickly as toenails.
Like hair, nails grow more rapidly in summer than in winter. If a nail
is torn off, it will regrow if the matrix isn't severely injured. White
spots on the nail are sometimes due to temporary changes in growth rate.


Some of the things that can affect the skin, nails, and hair are described below.


Dermatitis




The term dermatitis refers to any inflammation (swelling, itching,
and redness) possibly associated with the skin. There are many types of
dermatitis, including:




* Atopic dermatitis (eczema).
It's a common, hereditary dermatitis that causes an itchy rash
primarily on the face, trunk, arms, and legs. It commonly develops in
infancy, but can also appear in early childhood. It may be associated
with allergic diseases such as asthma and seasonal, environmental, and
food allergies.
* Contact dermatitis. This occurs when the skin comes
into contact with an irritating substance or one that the person is
allergic or sensitive to. The best-known cause of contact dermatitis is
poison ivy, but there are many others, including chemicals found in
laundry detergent, cosmetics, and perfumes, and metals like nickel
plating on jewelry, belt buckles, and the back of a snap.
* Seborrheic dermatitis. This oily rash, which
appears on the scalp, face, chest, and back, is related to an
overproduction of sebum from the sebaceous glands. This condition is
common in infants and adolescents.
*

Bacterial Skin Infections
* Impetigo. Impetigo is a bacterial infection that results in a
honey-colored, crusty rash, often on the face near the mouth and nose.
* Cellulitis.
Cellulitis is an infection of the skin and subcutaneous tissue that
typically occurs when bacteria are introduced through a puncture, bite,
or other break in the skin. The area with cellulitis is usually warm,
tender, and has some redness.
* Streptococcal and staphylococcal infections.
These two kinds of bacteria are the main causes of cellulitis and
impetigo. Certain types of these bacteria are also responsible for
distinctive rashes on the skin, including the rashes associated with scarlet fever and toxic shock syndrome.




Fungal Infections of the Skin and Nails






* Candidal dermatitis.
A warm, moist environment, such as that found in the folds of the skin
in the diaper area of infants, is perfect for growth of the yeast
Candida. Yeast infections of the skin in older children, teens, and
adults are less common.
* Tinea infection (ringworm). Ringworm,
which isn't a worm at all, is a fungus infection that can affect the
skin, nails, or scalp. Tinea
fungi can infect the skin and related tissues of the body. The medical
name for ringworm of the scalp is tinea capitis; ringworm of the body is
called tinea corporis; and ringworm of the nails is called tinea
unguium. With tinea corporis, the fungi can cause scaly, ring-like
lesions anywhere on the body.
* Tinea pedis (athlete's foot).
This infection of the feet is caused by the same types of fungi that
cause ringworm. Athlete's foot is commonly found in adolescents and is
more likely to occur during warm weather.
*

Other Skin Problems
* Parasitic infestations. Parasites (usually tiny insects or worms)
can feed on or burrow into the skin, often resulting in an itchy rash.
Scabies and lice are examples of parasitic infestations. Both are
contagious and can be easily caught from other people.
* Viral
infections. Many viruses cause characteristic rashes on the skin,
including varicella, the virus that causes chickenpox and shingles;
herpes simplex, which causes cold sores; human papillomavirus, the virus
that causes warts; and a host of others.
* Acne (acne vulgaris). Acne is most
common in teens. Some degree of acne is seen in 85% of adolescents, and
nearly all teens have the occasional pimple, blackhead, or whitehead.
* Skin cancer. Skin cancer is rare in children and teens, but good
sun protection habits established during these years can help prevent
skin cancers such as melanoma
(a serious form of skin cancer that can spread to other parts of the
body) later in life, especially among fair-skinned people who sunburn
easily.




In addition to these diseases and conditions, the skin can be injured
in a number of ways. Minor scrapes, cuts, and bruises heal quickly on
their own, but other injuries — severe cuts and burns, for example —
require medical treatment.


Disorders of the Scalp and Hair






* Tinea capitis, a type of ringworm, is a fungal
infection that forms a scaly, ring-like lesion in the scalp. It's
contagious and common among school-age children.
* Alopecia is an area of hair loss. Ringworm is a
common cause of temporary alopecia in children. Alopecia can also be
caused by tight braiding that pulls on the hair roots (called tension
alopecia). Alopecia areata (when hair falls out in round or oval patches
on the scalp) is a less common condition that can affect children and
teens.
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رد: Skin, Hair, and Nails

مُساهمة من طرف sheto في 4/5/2011, 3:22 am

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