Dying For A Tan
No one knows the suns energy output although it is estimated to be 386 billion, billion megawatts. Some of this energy makes it to the Earth in the form of ultraviolet radiation. There are 3 types of ultraviolet radiation: UVA, UVB and UVC. These UV rays can damage skin cells if they come into contact with unprotected flesh, this can in turn cause skin cancer. So why would anyone want to be out in the sun for long periods of time? The simple answer is that UVA library and UVB rays can both give you a suntan. [1]
To understand the effects on the body of ultraviolet radiation we must first look at the physiology of the skin. The skin (or as it is sometimes known the cutaneous membrane) envelops surface of the body. It is considered to be an organ as it is made up of many tissues all working together. The composition of the skin consists of two main parts. The exterior, thinner layer, which is made up of epithelial tissue, is the epidermis. [2] The epithelial tissue is composed of......
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