UVA & UVB effects

What do UVA & UVB mean?
Short term effects of UV exposure
Long term effects of UV exposure

Article: Short term effects of UV exposure

•   Sunburn
•   Tanning
•   Thickening of the skin

When over-exposed to UV rays, the skin becomes red, swollen, tender and painful – a condition better known as sunburn. Sunburn is an acute inflammatory response. It normally produces a protective effect since most sunburn victims will avoid continued sun exposure, thereby preventing further damage.

The main short-term effects of sun exposure are to induce tanning and thickening of the skin, both of which are protective. Tanning involves stimulation of and conversion of pre-formed melanin into melanin that is then distributed through the upper layers of the skin, giving you that tanned look. Melanin quenches UV light and provides significant protection to the skin from further damage by UV light.

Following sun exposure, the upper layers of the skin (the epidermis) show increased thickness. This, again, is a protective mechanism increasing the layers of epidermal cells that need to be penetrated by UV light before the sensitive basal cells can be affected.

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