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Related Concept Videos

Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal part of the DCT, along with the...
Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

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...
Reabsorption and Secretion in the PCT01:28

Reabsorption and Secretion in the PCT

The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes.
A key example is the...
Nephrons01:10

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...
Tubular Reabsorption and Secretion01:28

Tubular Reabsorption and Secretion

Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
Tubular reabsorption is a selective process that starts when the filtrate enters the proximal tubules. It involves substances traveling through the transcellular route (through the tubule cell and peritubular...
Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...

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Related Experiment Video

Updated: Jun 26, 2026

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney
08:53

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Published on: August 9, 2014

Ciliar functions in the nephron.

Lise Rodat-Despoix1, Patrick Delmas

  • 1Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille, CNRS, UMR, Université de la Méditerranée, France. lise.rodat-despoix@univmed.fr

Pflugers Archiv : European Journal of Physiology
|January 21, 2009
PubMed
Summary
This summary is machine-generated.

The primary cilium, once thought vestigial, is crucial for kidney function and sensing. Disruptions in these kidney cilia cause diseases like polycystic kidney disease.

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Last Updated: Jun 26, 2026

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Area of Science:

  • Cell Biology
  • Physiology
  • Nephrology

Background:

  • The primary cilium is a microtubule-based organelle present in most mammalian cells.
  • Previously considered vestigial, it now plays vital roles in physiology and tissue homeostasis.
  • In kidney epithelial cells, primary cilia act as mechanosensors and chemosensors, essential for tubule function.

Purpose of the Study:

  • To introduce the cell biology and function of renal primary cilia.
  • To review the roles of primary cilia in kidney physiology and homeostasis.
  • To provide an overview of kidney diseases associated with primary cilia dysfunction.

Main Methods:

  • Literature review of primary cilia research.
  • Analysis of studies on renal primary cilia function.
  • Compilation of information on cilia-related kidney diseases.

Main Results:

  • Primary cilia are integral to kidney tubule organization and function.
  • Dysfunction of primary cilia is linked to several kidney diseases, including polycystic kidney disease.
  • Proteins involved in cystic kidney diseases are often localized within primary cilia.

Conclusions:

  • Primary cilia are essential for normal kidney function and serve critical sensory roles.
  • Understanding renal primary cilia biology is key to addressing cilia-related kidney diseases.
  • Further research into primary cilia can illuminate mechanisms of kidney disease pathogenesis.