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Quiz yourself on Water RegulationGet your flashcardsBuild my revision planTrack my progress💧 The Story: Your Body's Water Filter
Your kidneys filter roughly 180 litres of blood every single day — enough to fill a bathtub. Yet you only produce about 1–2 litres of urine. What happens to the other 178 litres? The answer is selective reabsorption: your kidneys take back exactly what your body needs and discard the rest. The precision of this process is staggering. Whether you drink a litre of water or run a 10 km race without a sip, a hormone called ADH adjusts the kidneys minute-by-minute to keep your blood water concentration almost perfectly constant. This is osmoregulation — one of the most finely tuned control systems in the human body.
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