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The health benefits of exposing skin to sunlight may far outweigh the risk of developing skin cancer,according to scientists.
肉丸怎么做Edinburgh University rearch suggests sunlight helps reduce blood pressure,cutting heart attack and stroke risks and even prolonging life.
UV rays were found to relea a compound which lowers blood pressure.
Rearchers said more studies would be carried out to determine if it is time to reconsider advice on skin exposure.
Heart dia and stroke linked to high blood pressure are estimated to lead to about 80-times more deaths than tho from skin cancer in the UK.
Production of the pressure reducing compound is parate from the body's manufacture of vitamin D,which ris after exposure to sunshine.
防传染病手抄报Rearchers said that until now vitamin D had been thought to solely explain the sun's benefit to human health.ca工具
During the rearch,rearchers studied the blood pressure of 24 volunteers under UV and heat lampsIn one ssion,the volunteers were expod to both the UV rays and the heat of the lamps.
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In the other,the UV rays were blocked so that only the heat of the lamps affected the skin.
The results showed that blood pressure dropped significantly for one hour following exposure to UV rays,but not after the heat-only ssions.
Scientists said that this suggested it was the sun's UV rays that lead to health benefits.
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The volunteers'vitamin D levels remained unaffected in both ssions.
The study will be prented in Edinburgh at the world's largest gathering of skin experts.
Questions 23-25 are bad on the passage you have just heard.
Question 23.What can be learned from Edinburgh University's rearch?
Question 24.What was thought to be the only element to explain sun's benefit to human health?
Question 25.Which element is said to be unaffected in the rearch?
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