Today I will be concentrating on the positive and negative effects of solar radiation.These unbalanced scale show the positive and the negative effects of UV.It illustrates how they weigh each other.
Positive (beneficial) effects of UV
Triggers vitamin D – rays from the Sun is needed by our bodies to produce vitamin D. Vitamin D helps strengthen bones, muscles and the body’s immune system. It may also lower the risk of having some kinds of cancers such as colon cancer.
Helps some skin conditions – The suns rays are used in the treatment of skin conditions such as psoriasis. It is a condition where the skin sheds its cells too quickly and develops itchy, scaly patches. Exposure to sunlight slows the growth of the skin cells and relieves the symptoms.
Helps moods – Research says that sunlight stimulates the pineal gland in the brain to produce certain chemicals called ‘tryptamines’. The chemicals improve our mood.
Helps some animals’ vision – Some animals can see into the near UV light to locate many ripe fruits, flowers and seeds that stand out more strongly from the background. The fruits, flowers and seeds rarely appear quite different from how humans see them. For example, when seen in the rays of light, some flowers have different line markings, which may help direct bees and birds to the nectar.
Aids some insects’ navigation – Many insects use suns rays for emissions from celestial objects as references for navigating in flight. This is why a light can attracts flying insects by disrupting their navigation process.
Negative (harmful) effects of UV
Causes sunburn -Suns rays burns the skin. Sunburn is a burn that happens occurs when skin cells are damaged. This destroys the skin is caused by the absorption of energy from UV rays. An extra blood flows to the damaged skin in an attempt to repair it, which is why your skin turns red when you are sunburnt.
Damages immune system – Over-exposure to the suns radiation has a harmful suppressing effect on the immune system. Scientists believe that sunburn can alter the distribution and function of disease-fighting white blood cells in humans for up to 24 hours after exposure to the sun. Repeated over-exposure to UV radiation can result to even more damage to the body's immune system. The immune system offends the body against bacteria, microbes, viruses, toxins and parasites (disease and infection). You can realise how effective the immune system is by looking at how quickly something decays when it dies and the immune system stops working.
Damages eyes – Prolonged exposure to UV or high intensities of UV (for example, in sunbeds) destroys the tissues of eyes and can cause a ‘burning’ of the eye surface, called ‘snow blindness’ or photokeratitis. The effects usually disappear within a couple of days, but may result to further complications later in life. In 1998, the Journal of the American Medical Association reported that even low amounts of sunlight can increase the danger of developing eye damage such as cataracts (which, left untreated, will cause blindness), pterygium and pinguecula. Suns rays exposure damage to the eyes is cumulative, so it is never too late to start protecting the eyes.