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Renal Corpuscle

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...

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.

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...

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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).
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Renal Drug Excretion: Glomerular Filtration

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.
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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.
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Related Experiment Video

Updated: Jun 24, 2026

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

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

Published on: April 17, 2013

Glomerular permeability to macromolecules in the Necturus kidney.

George A Tanner¹, Catarina Rippe, Youzhi Shao

¹Department of Cellular and Integrative Physiology, Indiana Univ. School of Medicine, 635 Barnhill Dr., MS 332, Indianapolis, IN 46202, USA. gtanner@iupui.edu

American Journal of Physiology. Renal Physiology

|April 3, 2009

Summary

The glomerular basement membrane does not filter macromolecules by size or charge. The podocyte slit diaphragm acts as the primary filtration barrier, preventing albumin from passing and mesangial cells clear penetrated molecules to prevent filter clogging.

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Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

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

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Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

Published on: January 18, 2019

Area of Science:

Nephrology
Physiology
Cell Biology

Background:

The precise mechanisms of glomerular filtration, including the primary filtration barrier, charge effects, and clog prevention, remain debated.
Understanding these processes is crucial for diagnosing and treating kidney diseases.

Purpose of the Study:

To investigate the glomerular filtration barrier's role in macromolecule filtration.
To determine the impact of molecular size and electrical charge on filtration.
To identify the main barrier to albumin filtration and the mechanism preventing filter clogging.

Main Methods:

Utilized a two-photon microscope for in vivo visualization of fluorescently labeled probes in Necturus maculosus glomeruli.
Measured glomerular basement membrane (GBM)/plasma concentration ratios for various macromolecules (e.g., myoglobin, ovalbumin, albumin, dextrans) and inulin.
Examined glomerular sieving coefficients (GSCs) for native and neutral macromolecules to assess charge effects.

Main Results:

The GBM did not discriminate between inulin and smaller macromolecules like myoglobin, ovalbumin, and serum albumin.
Larger dextrans (500 and 2,000 kDa) showed significantly lower GBM/plasma concentration ratios than inulin.
GSCs decreased with increasing molecular mass, and serum albumin had very low GSCs, indicating the podocyte slit diaphragm is the main barrier to albumin.
Electrical charge had no detectable effect on the filterability of human serum albumin or 40 kDa dextran.
Mesangial and endothelial cells were observed to take up macromolecules that penetrated the GBM, suggesting a role in preventing filter clogging.

Conclusions:

The glomerular basement membrane (GBM) does not act as a size or charge-selective barrier for most macromolecules.
The podocyte slit diaphragm is identified as the primary filtration barrier preventing albumin passage.
Mesangial and endothelial cells play a role in clearing macromolecules from the GBM, preventing filter clogging.