Edexcel IGCSE Biology 2 72b Kidney Excretion and Osmoregulation Questions

Explain how kidneys excrete metabolic waste and regulate water balance. Use nephron processes and urine-volume or concentration data to connect filtration, reabsorption and ADH control.

Exam points

Explain why water reabsorption raises urea concentration in urine while urea remains in the filtrate.
Interpret urine-volume and concentration data in relation to water intake, food, temperature, exercise and environmental conditions.
Explain osmoregulation through osmoreceptor detection, ADH release, collecting-duct permeability and water reabsorption.

[Maximum number: 1]

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

Figure for Question Edexcel IGCSE Biology 2 72b Kidney Excretion and Osmoregulation Questions question 1 — Edexcel IGCSE Biology

In homeostasis, the kidney is involved in the control of blood concentration.

State the name for the control of blood concentration.

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Edexcel IGCSE Biology 2 72b Kidney Excretion and Osmoregulation Questions question 1