What effect does ultraviolet radiation have on skin cells?
The sun’s ultraviolet light can cause major damage to the skin. The outer layer of the skin has cells that contain the pigment melanin. Melanin protects skin from the sun’s ultraviolet rays. These can burn the skin and reduce its elasticity, leading to premature aging.
How does skin react to UV light?
In most cases, UV rays react with a chemical in the skin called melanin. This is the first defense against the sun. Melanin absorbs the dangerous UV rays that can do serious skin damage. But melanin can’t absorb all the UV rays, and some people don’t have much melanin in their skin.
How does UV radiation affect people with different types of skin pigmentation?
UV radiation induces immediate pigment darkening (IPD) by chemical modification of melanin, and possibly spatial redistribution of melanosomes in keratinocytes and melanocytes (7). UV exposure also leads to delayed tanning (DT) by new synthesis of melanin over several days after UV exposure and persists for weeks (8).
What is the effect of exposure to UV rays on the skin quizlet?
UV rays damage the skin’s cellular DNA, which can result in genetic mutations leading to cancer.
How does ultraviolet light affect your skin cells differentiate between UVA and UVB rays?
UVA rays can penetrate your skin more deeply and cause your skin cells to age prematurely. About 95 percent of the UV rays that reach the ground are UVA rays. The other 5 percent of UV rays are UVB. They have higher energy levels than UVA rays, and typically damage the outermost layers of your skin, causing sunburn.
Does UV light penetrate skin?
UV penetrates the skin in a wavelengthdependent manner. Longer wavelength UVA penetrates deeply into the dermis reaching well into the dermis. In contrast, UVB is almost completely absorbed by the epidermis, with comparatively little reaching the dermis.
Why is UV light beneficial to your skin?
Benefits. Beneficial effects of UV radiation include the production of vitamin D, a vitamin essential to human health. Vitamin D helps the body absorb calcium and phosphorus from food and assists bone development. The World Health Organization (WHO) recommends 5 to 15 minutes of sun exposure 2 to 3 times a week.
Does UVA or UVB cause hyperpigmentation?
UVA induces immediate tanning and persistent pigment darkening through oxidation of pre-existing melanin or melanogenic precursors, while UVB induces delayed tanning which takes several days or longer to develop and requires activation of melanocytes.
What happens to the skin when it is exposed to sunlight and becomes darker?
When the skin is exposed to the sun, it makes more melanin to protect the skin’s lower layers from damage. As the skin becomes damaged, it produces even more melanin. The extra melanin causes some people to become a darker color, or tan.
What happens in the skin when it is exposed to sunlight and becomes darker quizlet?
7. When exposed to the ultraviolet radiation in sunlight, melanocytes in the epidermis and dermis synthesize the pigment melanin, darkening the skin. The oxygenated blood gives a reddish col- oration to the skin.