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The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
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It is convenient to consider the body's structures in terms of fundamental levels of organization that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, and organisms.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Isomerism in Complexes
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Updated: Feb 8, 2026

Isogenic Kidney Glomerulus Chip Engineered from Human Induced Pluripotent Stem Cells
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Novel hemodynamic structures in the human glomerulus.

Christopher R Neal1, Kenton P Arkill2, James S Bell3

  • 1Bristol Renal and School of Physiology, Pharmacology and Neuroscience, University of Bristol , Bristol , United Kingdom.

American Journal of Physiology. Renal Physiology
|June 21, 2018
PubMed
Summary
This summary is machine-generated.

New research reveals previously undescribed vascular chambers in human glomeruli. These structures, with unique collagenous walls, may regulate blood flow and pressure within kidney filtration capillaries.

Keywords:
conduit vesselsglomerular microcirculationhemodynamicsmesangial collagenvascular chambers

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Anatomy

Background:

  • The intricate structure of human glomeruli is crucial for kidney function.
  • Understanding glomerular microvasculature under physiological conditions is essential for diagnosing and treating kidney diseases.

Purpose of the Study:

  • To investigate the detailed structure of human glomeruli under physiological perfusion.
  • To identify and characterize novel anatomical features within the glomerular vascular pole.

Main Methods:

  • Analysis of fresh and perfusion-fixed human glomeruli.
  • Utilized serial resin section reconstruction, confocal, multiphoton, and electron microscopy.
  • Examined glomeruli at physiological hydrostatic and oncotic pressures.

Main Results:

  • Identified previously undescribed vascular chambers (VCs) at the vascular pole, with afferent VCs (AVCs) being larger than efferent VCs (EVCs).
  • Discovered unique conduit vessels originating from AVCs and a distinct branching pattern of efferent vessels converging on EVCs.
  • Confirmed the presence of banded collagen in AVC walls, potentially influencing flow dynamics.

Conclusions:

  • The identified glomerular vascular chambers and unique branching topology suggest a mechanism for regulating hemodynamic pressure and flow distribution.
  • This structure deviates from minimum energy expenditure models, prioritizing even flow distribution to filtration capillaries.
  • These findings offer new insights into human glomerular hemodynamics and potential implications for kidney health.