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Related Concept Videos

Physiology of Urine Formation01:24

Physiology of Urine Formation

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Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
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Urine Studies I: Urinalysis01:29

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Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
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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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Formation of Dilute Urine01:20

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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.
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Formation of Concentrated Urine01:23

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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...
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Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

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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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One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure
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Urine Metabolome during Parturition.

Federica Gevi1, Alessandra Meloni2, Rossella Mereu2

  • 1Department of Biology and Ecology, University of Tuscia, 01100 Viterbo, Italy.

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|July 26, 2020
PubMed
Summary

Metabolomics reveals significant urinary metabolic shifts during childbirth labor, particularly in steroid hormones and amino acids. These findings highlight urine analysis as an effective, non-invasive method for prenatal research.

Keywords:
amino acidconjugated estrogensdilating phaseestrogensin laborout of laborurine metabolomic profile

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Area of Science:

  • Reproductive biology and metabolomics
  • Biomarker discovery in prenatal research

Background:

  • Metabolic changes occur during human childbirth labor.
  • Metabolomics offers detailed insights into pregnancy and potential biomarker identification.

Purpose of the Study:

  • To investigate metabolic differences in urine between women before and during labor.
  • To identify potential urinary biomarkers associated with labor onset.

Main Methods:

  • Observational, longitudinal, prospective cohort study.
  • Analysis of 51 serial urine samples from 15 healthy pregnant women using hydrophilic interaction ultra-performance liquid chromatography coupled with mass spectrometry (HILIC-UPLC-MS).
  • Multivariate statistical analysis to identify discriminative metabolites and pathways.

Main Results:

  • Identified the top 20 most discriminative metabolites separating samples collected out of labor (OL) from those in labor (IL-DP).
  • Urinary metabolites with the largest differences included steroid hormones (conjugated estrogens) and amino acids.
  • Significant metabolic differences are influenced by fetal contribution.

Conclusions:

  • Urinary metabolomics effectively differentiates metabolic states before and during labor.
  • Urine analysis is a viable, non-invasive alternative to more invasive methods for metabolic assessment during pregnancy and labor.
  • Identified key metabolite classes that may serve as biomarkers for labor onset.