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Related Concept Videos

Formation of Concentrated Urine01:23

Formation of Concentrated Urine

There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
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...
Formation of Dilute Urine01:20

Formation of Dilute Urine

The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
Filtrate Osmolarity in the PCT
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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...
Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
Reabsorption and Secretion in the Loop of Henle01:17

Reabsorption and Secretion in the Loop of Henle

The thick ascending limb of the nephron loop has Na+–K+–2Cl− symporters in the apical membranes of its cells. These symporters simultaneously reclaim one sodium ion, one potassium ion, and two chloride ions from the tubular fluid. Sodium ions are actively transported into the interstitial fluid at the base and sides of the cell, diffusing into the vasa recta. Chloride ions move through leakage channels in the basolateral membrane into the interstitial fluid and then into the vasa recta.

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Related Experiment Video

Updated: Jun 19, 2026

An Immature Murine Model of Reversible Unilateral Ureteral Obstruction
06:37

An Immature Murine Model of Reversible Unilateral Ureteral Obstruction

Published on: April 4, 2025

CHLORIDE RETENTION IN EXPERIMENTAL HYDRONEPHROSIS.

N M Keith1, D S Pulford

  • 1Department of Urology of the Johns Hopkins Hospital, Baltimore, Md., and the Division of Medicine of Mayo Clinic, Rochester, Minn.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Acute hydronephrosis causes retention of water and chlorides, impacting plasma chloride levels. Renal function recovery after obstruction varies, with potential temporary chloride retention.

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Area of Science:

  • Nephrology
  • Renal Physiology

Background:

  • Hydronephrosis, a condition of kidney swelling caused by urine backup, affects renal function.
  • Understanding chloride and water balance is crucial in renal pathophysiology.

Purpose of the Study:

  • To investigate chloride and water retention in experimental hydronephrosis.
  • To analyze the impact of ureteral obstruction removal on renal excretory functions.

Main Methods:

  • Experimental induction of acute hydronephrosis in animal models.
  • Monitoring of plasma chloride, water, urea, and phenolsulfonephthalein excretion.
  • Observation of renal function recovery post-ureteral obstruction relief.

Main Results:

  • Acute hydronephrosis leads to retention of water, urea, and chlorides.
  • Plasma chloride levels rise significantly when only chlorides are retained, not water.
  • Renal function recovery post-obstruction can be rapid and equal for all substances, or show temporary chloride retention.
  • Chronic hydronephrosis may maintain urea and chloride excretion via compensatory polyuria.
  • Abnormal chloride excretion can occur in specific renal lesions without affecting other excretory functions.

Conclusions:

  • Chloride and water retention are key features of acute hydronephrosis.
  • Plasma chloride dynamics depend on concurrent water retention.
  • Renal recovery patterns post-obstruction are variable.
  • Compensatory polyuria can facilitate adequate excretion in chronic hydronephrosis.
  • Chloride excretion abnormalities may indicate specific renal pathologies independent of urea or water handling.