Beginning of Essay
For a child with life is mostly a series of respitory infections doctors visits and medications. causes a build up of mucus in th lungs making breathing difficult . The thick mucus coats the hairlike projections lining air passage weakening the bodys immune syst ....

Middle of Essay
.... sweat making it vey salty . At the University of North Carolina researchers found that salt imbalance caues thick mucus to accumulate in the patients lungd. High level of salt in lung cells draw water out of the mucus causing it to thicken.The level of salt in a cell is determained by the movement of ions across the cell membrane.Ions are carried across call memebranes by protein channels embedded in the cell membrane. Since the stucture and functions of proteins are determained by genes problems with ion transport can be assumed to have a genetic basis. In 1989 an American Canadian research team found thre defect in the gene called the transmemb ....