water in the lungs 2.0 / 5 based on 1 rating ? AccountingASEdexcel Created by: Leigh. xCreated on: 22-10-12 21:08 Excess water in lungs Na+ is actively pumped across the basal membrane Na+ diffuses through sodium channels in the apicl membrane Cl- diffuses down an electrical gradient water is drawn out of the cells by osmosis due to high salt concentration in the tissue fluid. Water is drawn out of the mucus by osmosis 1 of 3 Too little water in lungs Cl- is pumped into the cells across the basal membrane Cl- diffuses rthrough the open CFTR channels Na+ diffuses down the electrical gradient into the mucus Elevated salt concentration in the mucus draws water out of the cell by osmosis water is drawn into the cell by osmosis 2 of 3 With CF CFTR channel is absorbant or not functional Na+ channel is perminently open water is continually removed from mucus by osmosis 3 of 3
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