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Kidneys for IGCSE Part 4: The Role of Kidneys in Osmoregulation 

The Functions of the Liver (useful for reference)

Kidneys for IGCSE Part 2: Ultrafiltration and Selective Reabsorption 

Excretion of Substances (contains full IGCSE specification details)

Kidneys for IGCSE Part 3: The Loops of Henle and Tubular Secretion 

Kidneys for IGCSE Part 1: The Anatomy of a Kidney 

QUIZZES & REVISION VIDEOS