The cholera toxin causes diarrhoea because

  1. it stops peristalsis
  2. it destroys red blood cells
  3. chloride ions are secreted into the gut and water follows by osmosis
  4. it kills the villi
Answer

C) chloride ions are secreted into the gut and water follows by osmosis

Ions lower gut water potential; water moves in. O Level Biology · Topic 12 Disease and Immunity · 12.1 Disease

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