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Related Concept Videos

Glomerular Filtration01:15

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.
Glomerular Filtration: Net Filtration Pressure01:26

Glomerular Filtration: Net Filtration Pressure

Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal tubule,...
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
Renal Corpuscle01:20

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous capillaries...
Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: 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 occurs. 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 arterioles.
Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

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...

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Related Experiment Video

Updated: Jun 23, 2026

Highly Sensitive Measurement of Glomerular Permeability in Mice with Fluorescein Isothiocyanate-polysucrose 70
09:16

Highly Sensitive Measurement of Glomerular Permeability in Mice with Fluorescein Isothiocyanate-polysucrose 70

Published on: August 9, 2019

Update on the glomerular filtration barrier.

George Jarad1, Jeffrey H Miner

  • 1Renal Division, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Current Opinion in Nephrology and Hypertension
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

The glomerular filtration barrier (GFB) is a dynamic structure, not rigid, requiring three healthy layers and stable hemodynamics. Understanding proteinuria involves reevaluating tubular uptake and the GFB

More Related Videos

Quantifying Glomerular Permeability of Fluorescent Macromolecules Using 2-Photon Microscopy in Munich Wistar Rats
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Quantifying Glomerular Permeability of Fluorescent Macromolecules Using 2-Photon Microscopy in Munich Wistar Rats

Published on: April 17, 2013

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
10:14

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney

Published on: November 1, 2018

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Last Updated: Jun 23, 2026

Highly Sensitive Measurement of Glomerular Permeability in Mice with Fluorescein Isothiocyanate-polysucrose 70
09:16

Highly Sensitive Measurement of Glomerular Permeability in Mice with Fluorescein Isothiocyanate-polysucrose 70

Published on: August 9, 2019

Quantifying Glomerular Permeability of Fluorescent Macromolecules Using 2-Photon Microscopy in Munich Wistar Rats
11:13

Quantifying Glomerular Permeability of Fluorescent Macromolecules Using 2-Photon Microscopy in Munich Wistar Rats

Published on: April 17, 2013

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
10:14

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney

Published on: November 1, 2018

Area of Science:

  • Nephrology
  • Renal Physiology
  • Glomerular Filtration

Background:

  • The glomerular filtration barrier (GFB) comprises fenestrated endothelium, podocytes, and glomerular basement membrane.
  • Proteinuria can arise from abnormalities in any GFB layer or even a normal GFB.
  • A unified view of protein sieving across the GFB is lacking in the nephrology community.

Purpose of the Study:

  • To review classic and novel concepts regarding the glomerular filtration barrier (GFB).
  • To present competing hypotheses on the mechanisms of GFB function and proteinuria.
  • To address the lack of a unified view on protein sieving through the glomerular capillary wall.

Main Methods:

  • Review of classic and recent studies on glomerular filtration.
  • Analysis of competing hypotheses regarding the GFB.
  • Discussion of emerging concepts in renal physiology.

Main Results:

  • Reemerging concepts challenge the GFB's selectivity to albumin, suggesting abnormal tubular uptake.
  • Diffusion through the glomerular basement membrane is reemphasized as a key filtration mechanism.
  • The endothelial glycocalyx is identified as a significant charge-selective barrier.

Conclusions:

  • The GFB should be viewed as a dynamic entity, not static.
  • Optimal GFB function requires three healthy layers and hemodynamic stability.
  • Further research with new tools and hypotheses is needed to understand the endothelium, tubular albumin handling, and hemodynamic forces.