Biology 0610 · IGCSE · Diseases and immunity

Diseases and immunity — practice question

The cholera bacterium toxin leads to dehydration and loss of salts from the blood in humans. Which statement best explains why this happens?

  • AChloride ions are secreted into the small intestine where they increase the water potential.
  • BChloride ions are secreted into the small intestine which causes water to move into the intestine by osmosis.
  • CChloride ions are secreted into the small intestine which causes water to move out of the intestine by osmosis.
  • DChloride ions are secreted into the small intestine which causes the water potential of the blood to decrease.

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