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Related Concept Videos

Nephrons01:10

Nephrons

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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...
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Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

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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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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

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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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Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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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...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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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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Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
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Nephron number and its determinants: a 2020 update.

Jennifer R Charlton1, Edwin J Baldelomar2, Dylan M Hyatt3

  • 1Department of Pediatrics, Division of Nephrology, University of Virginia Children's Hospital, PO Box 800386, Charlottesville, VA, 22903, USA. jrc6n@virginia.edu.

Pediatric Nephrology (Berlin, Germany)
|May 1, 2020
PubMed
Summary

Human nephron number varies greatly, but the causes are unclear. Recent imaging advances help explore factors affecting nephron count and kidney disease progression.

Keywords:
CFE-MRIGlomerular numberNephrogenesisNephron endowment

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Medical Imaging

Background:

  • Human nephron number has been studied for over 100 years, revealing significant individual variability.
  • The underlying mechanisms of nephron endowment, loss, and the reasons for this wide range remain largely unknown.
  • Kidney disease progression is influenced by renal structure and physiology, areas being re-examined with new imaging technologies.

Purpose of the Study:

  • To review current data on factors influencing nephron number.
  • To highlight innovations in understanding renal structure and function over the past six years.
  • To discuss new in vivo methods for counting nephrons.

Main Methods:

  • Review of recent scientific literature on nephron number.
  • Analysis of advancements in medical imaging techniques for renal assessment.
  • Exploration of novel tools for in vivo nephron counting.

Main Results:

  • Significant variability in human nephron number is a long-established finding.
  • Recent technological progress is enhancing the understanding of factors impacting nephron count.
  • New in vivo tools are emerging for more accurate nephron quantification.

Conclusions:

  • Understanding nephron number variability is crucial for nephrology.
  • Advances in imaging and tools are improving insights into renal structure and function.
  • Further research is needed to elucidate the etiology of nephron number differences and their clinical implications.