explain the cause of cystic fibrosis

The cause of cystic fibrosis is a defect in the CFTR gene.  the CFTR gene makes a protein that controls the movement of salt and water in and out of your body's cells.  For people suffering with CF, the gene makes a protein that doesn't work.  This results in thick, sticky mucus and very salty sweat.  

Cystic Fibrosis is an inherited disease of the secretory glands.  Cystic Fibrosis mainly affects the lungs, pancreas, liver, intestines, sinuses and sex organs.