Cambridge IGCSE Biology
13.1Excretion in humans
Excretion in humans in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic18 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 13.1.1State what the lungs excrete (carbon dioxide) and what the kidneys excrete (urea, excess water and excess ions), and identify the kidneys, ureters, bladder and urethra.
- 13.1.2Supplement: identify the cortex and medulla of the kidney and outline how a nephron filters the blood and reabsorbs all the glucose, some ions and most of the water to form urine.
- 13.1.3Supplement: describe how the liver assimilates amino acids into proteins and deaminates excess amino acids to form urea, and explain why urea must be excreted.
Lessons
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Excretion: the kidneys and the liver
21 min
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Sample question
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