Biology 0610 · IGCSE · Osmosis

Osmosis — practice question

Cholera infection may lead to the following events. 1. The cells lining the small intestine release chloride ions. 2. Cholera bacteria release a toxin. 3. Chloride ions pass into the small intestine. 4. Water moves from the blood into the small intestine by osmosis. 5. The water potential of the fluid in the small intestine decreases. Which order of events will result in diarrhoea?

  • A$1 \rightarrow 3 \rightarrow 2 \rightarrow 4 \rightarrow 5$
  • B$2 \rightarrow 1 \rightarrow 3 \rightarrow 5 \rightarrow 4$
  • C$3 \rightarrow 1 \rightarrow 4 \rightarrow 5 \rightarrow 2$
  • D$2 \rightarrow 3 \rightarrow 1 \rightarrow 4 \rightarrow 5$

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