May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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18Pathogens Communicable DiseaseEasy1 mark
The cholera bacterium produces a toxin that results in water entering the alimentary canal and causing diarrhoea. The diagram shows the human alimentary canal. Into which region are chloride ions secreted as a result of the toxin?
Human alimentary canal with four regions labelled: A the J-shaped sac below the oesophagus, B the long coiled tube in the middle of the abdomen, C the wide tube running up the side of the abdomen, and D the large shaded organ at the top of the abdomen beside the sac