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The airway epithelial cells maintain a thin layer of watery liquid containing salt. Their cilia beat in the watery liquid to move mucus and particles out of the airway and into the back of the throat, where it is swallowed into the digestive tract. To maintain salt balance, the CFTR channel opens to allow Cl- ions to diffuse across the cell membrane and into the airway liquid. In the absence of CFTR function, the airway liquid becomes hypotonic. Which way will water molecules flow? A. from the surrounding cells into the airway B. from the airway into the cells that line the airway C. there will be no net movement of water into or out of the airway

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