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Introduction to Urinary System

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The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...

Diabetic Nephropathy

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Diabetes Insipidus I: Introduction

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Definition Diabetes insipidus is a disorder marked by the production of large amounts of dilute urine because of impaired vasopressin production, release, or kidney response. The lack of effective vasopressin action limits water reabsorption in the renal collecting ducts, which leads to excessive urinary water loss and intense thirst.Clinical PresentationIndividuals with diabetes insipidus report persistent thirst and very high urine output. In severe cases, fluid intake can reach up to 20...

Hormonal Regulation

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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.

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However, the intercalated cells in...

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Related Experiment Video

Updated: Jun 10, 2026

Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

Published on: May 2, 2025

[Diabetes mellitus: renal osmoregulating function].

Iu V Natochin, M V Shestakova, A A Kuznetsova

Terapevticheskii Arkhiv

|August 25, 2010

Summary

Diabetic kidney disease impairs renal concentrating ability, linked to reduced glomerular filtration and increased water reabsorption. This suggests evolving renal failure, not vasopressin resistance, impacts kidney function in diabetes mellitus (DM).

Related Experiment Videos

Last Updated: Jun 10, 2026

Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

Published on: May 2, 2025

Area of Science:

Nephrology
Endocrinology
Diabetology

Context:

Diabetes mellitus (DM) is a complex metabolic disorder with significant renal implications.
Diabetic nephropathy is a leading cause of chronic kidney disease worldwide.
Understanding the mechanisms of renal dysfunction in DM is crucial for patient management.

Purpose:

To assess kidney status in diabetes mellitus (DM) by examining osmotic urine concentration.
To determine if renal medullary structures are involved in the pathological process of DM.
To evaluate the kidney's response to endogenous vasopressin in different stages of DM.

Summary:

Forty patients with varying durations of DM were studied, including those with and without diabetic nephropathy and chronic renal failure.
Measurements included urine and blood osmolality, glomerular filtration rate, and renal osmoregulating function.
Results indicated a decreased glomerular filtration rate correlated with DM duration and diminished nocturnal urine osmolality after deprivation, suggesting impaired renal concentrating capacity.

Impact:

The study highlights that diminished renal concentrating capacity in DM is associated with progressive renal failure.
Increased reabsorption of osmotically free water may play a role in maintaining serum osmolality during hyperglycemia.
Findings suggest a novel approach to evaluating renal function in diabetic patients using sodium-free water clearance.