Edexcel IGCSE Biology 2.72B Urea formation
Practise explaining kidney excretion and osmoregulation, using urea concentration, urine volume calculations and nephron control processes.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
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
2.72B Kidney excretion and osmoregulation question 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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