http://www.rudramani.com
|
asthma affects a higher percentage of black children than whiteThe asthma triggers cause certain cells in the airways release chemical substances. These substances cause the airways to become inflamed and swollen and stimulate the muscle cells in the walls of the airways to contract. Repeated stimulation by these chemical substances increases mucus production in the airways, causes shedding of the cells lining the airways, and enlarges the muscle cells in the walls of the airways; Bach of these responses contributes lo a sudden narrowing of the airways (asthma attack). In most children, the airways return to normal between asthma attacks.
Risk Factors for Asthm : Doctors do not completely understand why some children develop asthma, but a number of risk factors are recognized. A child with one asthmatic parent has a 30% risk of developing asthma; if both parents have asthma, the risk increases to 60%. Children whose mothers smoked during pregnancy are more likely to develop asthma. In the United States, children in urban environments are more likely to develop asthma, particularly if they are from lower socioeconomic groups. Although asthma affects a higher percentage of black children than white, the role that genetic aspects of race play in the increasing rate of asthma is controversial because black children are also more likely to live in urban areas. Children who are exposed to high concentrations of allergens, such as dust mites or cockroach fetes, at an early age are more likely to develop asthma. |
http://www.rudramani.com
|
{ 2008 09 12 }
