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Filtration and Urine Formation

Filtration and Urine Formation

The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.

Drug Elimination by Renal Route: Glomerular Filtration

Drug Elimination by Renal Route: Glomerular Filtration

The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production takes place. A nephron has two main components: a renal corpuscle and a renal tubule. Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent...

Nephrons

Nephrons

The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma happens...

Glomerular Filtration

Glomerular Filtration

The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...

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Related Experiment Video

Updated: Jun 5, 2026

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

Published on: February 13, 2016

Bottom-up nanotechnology: the human nephron filter.

Allen R Nissenson¹

¹Division of Nephrology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California, USA. anissenson@mednet.ucla.edu

Seminars in Dialysis

|December 19, 2009

Summary

A novel nanotechnology-based human nephron filter (HNF) offers a potential wearable artificial kidney. This device mimics natural kidney function, aiming to improve quality of life for end-stage renal disease patients.

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Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule

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Published on: May 9, 2025

Area of Science:

Biotechnology
Nanotechnology
Nephrology

Background:

End-stage renal disease affects over one million patients globally, necessitating dialysis or transplantation.
Current renal replacement therapies have high mortality and morbidity rates, with limited quality of life for patients.

Purpose of the Study:

To develop a continuously functioning, wearable or implantable artificial kidney using nanotechnology.
To create a novel renal replacement therapy that mimics native kidney function without requiring dialysis solution.

Main Methods:

Development of a human nephron filter (HNF) utilizing bottom-up nanotechnology.
The HNF employs two series-operating membranes: one for glomerular filtration and one for tubular reabsorption.
Computer modeling was used to simulate HNF performance.

Main Results:

The HNF system eliminates the need for dialysate.
Computer modeling indicates the HNF can achieve a glomerular filtration rate equivalent of 30 ml/min when operating 12 hours daily.
The device utilizes a novel membrane system based on applied nanotechnology.

Conclusions:

The HNF represents a breakthrough in renal replacement therapy, mimicking native kidney function.
The device's enhanced solute removal and potential wearable design promise improved patient outcomes and quality of life.