In the lungs of cystic fibrosis patients, ____
a. chloride ions are stuck inside epithelial cells
b. water is excessively abundant on epithelial surfaces
c. epithelial surfaces are coated with slippery mucus
d. excess water and chloride ions are pumped out of epithelial cells
e. chloride ions are not transported out of epithelial cells, and epithelial surfaces are dry
ANSWER: e
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