When the mucas in the airways becomes too viscous, for example during exercise, the CFTR channel opens. The CFTR channels also inhibit the NA+ ion channels that allow Na+ ions to enter the cell from the mucas. Cl- ions are secreted into the mucas, and Na+ ions also build up in the mucas. This reverses the direction of osmosis. More water enters the mucas, reducing its viscosity.
Comments
No comments have yet been made