subject: Sun Exposure Protect yourself from Intense Sun [print this page] Sun Exposure Protect yourself from Intense Sun
The sun is so necessary for metabolic processes, may become a serious hazard to health if taken in moderation and protection. Solar radiation is responsible for both burns from prolonged exposure, as skin lesions and cumulative effect over the years. These adverse effects cover a wide range, from the unsightly wrinkles by photo damage to the malignant lesions, including melanoma.
Solar radiation which is naturally exposed humans, and especially that occupies the spectrum ultraviolet light, has a carcinogenic effect on the skin. In other words, inadequate exposure to sunlight can lead to the appearance of tumors. While 35 percent of cancers are due to smoking, another 35 percent is the result of poor diet with excess fat and lack of fiber, 10 percent is caused by ultraviolet radiation.
There are several types of ultraviolet radiation, the rays A and B rays historically, it was thought that B rays were the most harmful because they increased monogenic (tumor-building) in the long term, and because it produced a photo-aging is manifested by wrinkles and skin blemishes. Today we know that the rays have a similar deleterious effect on the skin.
It is very important that people understand that the effect of ultraviolet radiation on the skin is cumulative. Over the years, it will produce changes that accumulate and combine with other factors that assist the development of skin tumors.
Malignant skin lesions that can lead to inadequate exposure to ultraviolet rays are grouped into three groups: basal cell carcinoma, squalors cell carcinomas and melanomas.
The first are the most common injuries carcinogenic effect type that usually appear on the skin, i.e., malignant. Usually appear on exposed body areas which are subjected to the action of ultraviolet radiation throughout the year: the face, ears, hands and neck. These lesions have different clinical presentations, but they usually begin with an injury that precedes called solar Kerasotes, which is only a small scale, sometimes reddish, the patient is usually removed with a fingernail and returns to grow.
The human skin has three layers sensitive. The exposure sunlight cause cellular oxidation and accelerates aging. It is not simply a cosmetic problem; it alters the composition and function of different skin layers.
Epidermis
The epidermis is the outer layer of skin, which is composed of mature cells, but which functions to protect our body burns avoiding social action. Develop a substance called melanin, A pigment that gives skin its characteristic color.
Sun exposure causes this layer to decrease in the number of cells containing the pigment, causing loss of strength and elasticity of the skin.
Although melanin works to protect, can not avoid the damage that sunlight exerted medium and long term. The UVB rays generate so-called photo aging diminishing the ability of the skin for protection. They are also one of the main causes Skin Cancer, by altering cellular DNA.
Dermis
The dermis lies below the epidermis and contains nerve endings, sebaceous glands, sweat glands and blood vessels. Provides collagen and elastic Substances which make the strength and flexibility of the skin.
Before sun exposure, blood vessels become more fragile, and sebaceous glands produce less oil producing dry and limiting the ability of the skin to defend against bacteria. As decreases skin hydration, the skin's appearance is altered.
The UVA especially on the current dermis causing allergies and altering cellular DNA. Some consequences:
Loss of firmness
Wrinkles
Stains
Alteration of nerve endings: loss of sensitivity.
Hypodermis
The hypodermis is composed mainly of fat and helps the body stay warm and serves to absorb impact.
Sun exposure in this layer results in the destruction of cellular and extracellular component. The subcutaneous fat is reduced directly increasing the risk of skin injury. Reduced ability to maintain body temperature and to protect the body from the cold.
