Edexcel IGCSE Biology 2 72b Kidney Excretion and Osmoregulation Questions

Practise explaining kidney excretion and osmoregulation, using urea concentration, urine volume calculations and nephron control processes.

Exam points

explain urea concentration changes by linking water reabsorption to urea remaining in filtrate
calculate urine concentration or minimum volume from waste amount and urine concentration
link osmoregulation to hypothalamus detection, ADH release and collecting duct permeability

[Maximum number: 1]

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

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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