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Related Concept Videos

Capillary Beds01:20

Capillary Beds

7.1K
Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Capillary Exchange01:28

Capillary Exchange

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The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular...
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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Capillaries and Their Types01:20

Capillaries and Their Types

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Related Experiment Video

Updated: Jan 29, 2026

Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography

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Retinal capillary perfusion: Spatial and temporal heterogeneity.

Dao-Yi Yu1, Stephen J Cringle1, Paula K Yu1

  • 1Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia; Lions Eye Institute, The University of Western Australia, Perth, Australia.

Progress in Retinal and Eye Research
|February 16, 2019
PubMed
Summary
This summary is machine-generated.

The retina exhibits significant spatial and temporal heterogeneity in capillary perfusion, crucial for matching blood supply to metabolic demand. This heterogeneity, especially in the macula, may indicate early retinal vascular disease.

Keywords:
Capillary perfusionDiffusionMicrocirculationRetinaVascular endotheliumVasoactivityVasomotion

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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
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Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
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Area of Science:

  • Ophthalmology
  • Cardiovascular Physiology
  • Microcirculation Research

Background:

  • Capillary perfusion is heterogeneous in many organs, but this is underexplored in the retina.
  • The retina's high metabolic demand and unique structure necessitate sophisticated blood flow regulation.
  • Understanding retinal capillary perfusion heterogeneity is key to maintaining neural function and survival.

Purpose of the Study:

  • To review and update knowledge on retinal microvessels, capillary networks, and oxidative metabolism.
  • To explore the spatial and temporal heterogeneity of retinal capillary perfusion.
  • To investigate the coupling between retinal blood supply and energy demands.

Main Methods:

  • Review of existing literature on microcirculation and retinal physiology.
  • Analysis of experimental and clinical data on retinal capillary perfusion.
  • Investigation of retinal optical coherence tomography angiography (OCTA) for assessing perfusion.
  • Examination of arteriolar-capillary relationships and smooth muscle protein distribution.

Main Results:

  • Demonstrated spatial and temporal heterogeneity of retinal capillary perfusion experimentally and clinically.
  • Identified close relationships between arterioles and capillaries, and mapped smooth muscle proteins.
  • Highlighted the potential of OCTA in detecting retinal perfusion heterogeneity.
  • Found that small arterioles play a role in modulating retinal capillary perfusion.

Conclusions:

  • Retinal blood flow exhibits significant and necessary spatial and temporal heterogeneity, particularly in the macula.
  • Retinal capillary perfusion heterogeneity can serve as an early indicator of retinal vascular disease.
  • The retina is an excellent model for studying microcirculation heterogeneity, with OCTA offering clinical insights.