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Related Concept Videos

Regulation of Water Output01:26

Regulation of Water Output

The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
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...
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
Initially, as the filtrate passes through the proximal convoluted tubule (PCT), its...
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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Updated: May 10, 2026

Culturing Primary Rat Inner Medullary Collecting Duct Cells
06:11

Culturing Primary Rat Inner Medullary Collecting Duct Cells

Published on: June 21, 2013

Regulatory volume decrease of rat kidney principal cells after successive hypo-osmotic shocks.

Sotirios G Zarogiannis1, Alexander V Ilyaskin, Galina S Baturina

  • 1Department of Physiology, Medical School, University of Thessaly, Biopolis, Larissa, Greece. szarog@med.uth.gr

Mathematical Biosciences
|June 4, 2013
PubMed
Summary

Outer Medullary Collecting Duct (OMCD) principal cells regulate volume via regulatory volume decrease (RVD) to prevent cell death from osmotic stress. Repeated challenges within a minute impair RVD, causing cells to behave as ideal osmometers.

Keywords:
Cell volume regulationKidneyMathematical modelingOsmoregulationOsmotic stress

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Culturing Primary Rat Inner Medullary Collecting Duct Cells
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06:23

Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells

Published on: November 21, 2025

Area of Science:

  • Cell biology
  • Renal physiology
  • Biophysics

Background:

  • Outer Medullary Collecting Duct (OMCD) principal cells face significant extracellular osmolarity fluctuations.
  • Cell volume regulation is crucial to prevent cell death due to membrane rupture.
  • Regulatory Volume Decrease (RVD) is a key cellular response to hypertonic stress.

Purpose of the Study:

  • To analyze the sub-second temporal dynamics of RVD in rat kidney OMCD principal cells.
  • To investigate the impact of successive hypo-osmotic challenges on RVD.
  • To develop a mathematical model of RVD based on experimental data.

Main Methods:

  • Experimental cell volume measurements in rat kidney OMCD principal cells.
  • Application of two successive hypo-osmotic challenges.
  • Development of a mathematical model simulating RVD dynamics.

Main Results:

  • RVD involves expelling intracellular osmolytes and reducing plasma membrane water permeability.
  • A second osmotic challenge within one minute of the first significantly impairs RVD.
  • Cells exhibit ideal osmometer behavior when challenged rapidly after an initial RVD event.

Conclusions:

  • OMCD principal cells possess a time-dependent RVD mechanism crucial for survival.
  • The capacity for RVD is transiently lost following an initial osmotic shock.
  • The developed mathematical model provides a foundation for future RVD dynamical studies.