lunes, 23 de mayo de 2016

                                                   Diego Marques González 1B

                      16-Why do mosquitoes bite some people more than others?

The characteristics the people have which make more attractive for the mosquitoes are:
Blood Type
The mosquitoes bites us to harvest proteins from our blood ­research shows that they find blood types more appetizing than others. One study found that mosquitoes prefer  people with Type O blood,after the people with Type B and finally with Type A. Additionally, based on other studies, about 85 percent of people secrete a chemical signal through their skin that indicates which blood type they have, while 15 percent do not, and mosquitoes are also more attracted to secretors than non secretors regardless of which type they are.
Carbon Dioxide:
Other reason why mosquitoes bites more people than others is by smelling the carbon dioxide emitted in their breath­. They use an organ called a maxillary palp to do this, and can detect carbon dioxide from as far as 164 feet away. As a result, people who simply exhale more of the gas over time­ generally, larger people ­have been shown to attract more mosquitoes than others. This is one of the reasons why children get bit less often than adults.
Exercise and Metabolism
In addition to carbon dioxide, mosquitoes find victims at closer range by smelling the lactic acid, uric acid, ammonia and other substances expelled via their sweat, and are also attracted to people with higher body temperatures. Genetic factors influence the amount of uric acid and other substances naturally emitted by each person, making some people more easily found by mosquitos than others.

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