The Story: Your Body's Water Filter
Part of Water Regulation — GCSE Biology
This introduction covers The Story: Your Body's Water Filter within Water Regulation for GCSE Biology. Topic 7: Water Regulation It is section 1 of 11 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 1 of 11
Practice
15 questions
Recall
20 flashcards
💧 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.