Hey guys would someone be able to help me with this question? The correct answer is B btw:
The disease cystic fibrosis is caused by a gene mutation that produces an incorrectly formed protein channel, the CFTR (cystic fibrosis transmembrane conductance regulator). When this channel is not formed correctly, chloride ions will not be able to exit the cell. The accumulation of chloride ions causes the movement of water via osmosis.
Based on this information, which of the following are likely consequences of cystic fibrosis?
A. Large amounts of watery diarrhoea as chloride ions in the intestinal tract attract water.
B. Thick sticky mucus outside cells as water remains in the cell rather than move out via osmosis
C. Selective sodium channels provide an alternative passage of chloride ions.
D. Water will be actively transported into the cell following the accumulation of chloride ions.
I chose A as my answer because I thought that there would be a buildup of chloride ions inside the cell, meaning water would move into the cell via osmosis as the environment outside the cell would be hypotonic to the cell? Can someone explain why B is the correct answer instead?