Anatomy & Physiology › Section W · The urinary system › Topic W.3
Urine formation and tubular reabsorption
The kidneys filter roughly 180 L of plasma a day, then take almost all of it back. This topic explains the pressures that drive filtration, how filtration rate is measured, and how each part of the nephron reclaims what the body needs and builds the gradient that lets urine be concentrated.
In this topic
- Three processes
- The pressures of filtration
- Glomerular filtration rate
- Measuring GFR with clearance
- Worked example: clearance and filtration
- The proximal convoluted tubule
- Worked example: glucose and the transport maximum
- The nephron loop and the medullary gradient
- Keeping the gradient
- DCT and collecting ducts: the fine-tuning
- Common mistakes to avoid
- Key takeaways
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