Earlier today, I undertook an exam which featured a question regarding the stickiness of mucus in a person diagnosed with CF's. We had to explain why they had stickier mucus than a 'normal' person, given that CF changes the protein channels used for chloride ions to move through osmosis. This confused me, becuase I thought osmosis was through a permeable membrane, and active transport used a protein channel. I have googled it and I have been proved neither wrong nor right.
Basically, I want to know if osmosis requires or uses a protein channel, or the exam board wrote the question wrong and should have put active transport instead.
(Sorry for the waffle, I just felt some clarification is needed)