Edexcel IGCSE Biology 2 76b Water Reabsorption From the Collecting Duct Questions

Connect ion concentration around the collecting duct with osmosis, water reabsorption into blood and the resulting change in urine concentration.

Exam points

Explain osmosis moving water into blood from the collecting duct when nearby tissue has a high ion concentration.
Explain urea concentration rising in filtrate as water is reabsorbed from the collecting duct.

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The diagram shows a nephron of a kidney, with some of the structures labelled.

Desmopressin is a drug used to reduce the symptoms of diabetes insipidus.

Suggest what effect the drug would have on the nephron.

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