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Sunbathing A danger to your health, physics coursework

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Introduction

Sunbathing, A Danger to your health?                                                   Aine Moylett

SUNBATHING

A danger to your health?image00.png

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How Does Tanning Happen?

When people sit outside sun bathing the sun’s rays are hitting your body. These rays contain two types of ultra-violet radiation. They are UVA and UVB.

These types of UV have different effects on your skin. UVA radiation gives you a tan whereas UVB radiation burns the upper layers of skin, causing sunburn.

Melanin is the brown pigment in your skin that makes you tan. The UVA pass through the lower layers of your skin and they make cells called melanocytes to produce melanin.

Melanin also provides protection from UV radiation. People whose ancestors lived in sunnier areas of the world are more likely to have protective brown skin.

Ultraviolet (UV) Light

Ultraviolet light is a form of radiation that is not visible to the human eye. It’s has shorter wavelengths then visible light. The ultraviolet part of the spectrum is divided into three sections. These sections are

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Middle

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Ultraviolet light converts cholesterol in the skin to vitamin D. This vitamin is essential for the creation of calcium which strengthens bones in the body. If we expose six square inches of our skin to direct sunlight for one hour per day, we will obtain our minimum daily requirement for vitamin D.

Sunlight helps to regulate almost all our body processes. Firstly sunbathing helps the mind. It has been shown to increase our sense of well-being and to improve sleep.

Sunlight can have positive effects on the thyroid and can balance hormone levels. Resting heart rate, blood pressure and respiration rates are all decreased after a sunbath.

Sunlight stimulates the production of more red blood cells which increasing the amount of oxygen in the blood, therefore increasing muscular stamina.

Disadvantages of Sunbathing

The Association of Dermatologists estimates that there are at least 65,000 new cases of skin cancer each year in the UK. Most of these are caused by exposure to ultra violet radiation. image04.jpg

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Conclusion

Conclusion

From what my research has taught me, everybody needs to get some exposure to the sun. However excessive exposure such as sun bathing is bad because you are damaging your skin and you increase the risk of getting cancer.

The positive effects of sunbathing maybe relaxing and nice at the time however they are only short term.

As a person with fair skin I always have to worry about the effects of being in the sun. I have to protect myself by using appropriate sun creams, wearing the right clothes and limiting my time in the sun.

In summary I believe that sun bathing in moderation has positive benefits for your mind and body but it is important to know your limits. Excessive exposure to the sun can ultimately kill you if you are not careful.

Bibliography

Websites

http://www.netdoctor.co.uk/health_advice/facts/sunbathing.htm

http://www.bbc.co.uk/health/conditions/skincancer1.shtml

http://www.thetanfactory.com/a_Vitamin_D.htm

http://science.hq.nasa.gov/kids/imagers/ems/uv.html

http://www.laterlife.com/laterlife-here-comes-the-sun.htm

Books

Twenty First Century Science: GCSE Physics

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