How does cholera cause diarrhoea and dehydration?
Cholera is single-celled organism that produces a toxin. The toxin attaches to the ion receptors in the small intestine which causes it to secrete chloride ions into the lumen. This then causes water to move in by osmosis (as the salt level is now higher in the lumen of the intestine) which can cause diarrhoea and dehydration.
MP
Related Biology A Level answers
All answers ▸Explain how the structure of an enzyme allows for it to act as a biological catalyst
If you're measuring an environment using a quadrat or another sampling instrument - why can't you just do it where you see the most biodiversity?
Describe the cardiac cycle, including the role that valves and pressure differences play in this process.
Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction.