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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Capillaries and Their Types01:20

Capillaries and Their Types

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, with...
Capillary Beds01:20

Capillary Beds

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,...
Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Introduction to Hemostasis01:05

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...

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Related Experiment Video

Updated: Jun 6, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
07:53

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

Microcirculation and Hemorheology.

Aleksander S Popel1, Paul C Johnson

  • 1Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, MD 21205; apopel@jhu.edu.

Annual Review of Fluid Mechanics
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

This review covers microcirculation and hemorheology, detailing blood flow mechanics, cellular interactions, and vascular regulation. It explores how blood cells interact with vessel walls and how microvasculature adapts over time.

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Last Updated: Jun 6, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

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Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
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Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases

Published on: June 22, 2012

Area of Science:

  • Physiology
  • Biophysics
  • Cardiovascular Science

Background:

  • Microcirculation is crucial for tissue homeostasis and nutrient exchange.
  • Hemorheology studies blood flow properties, impacting physiological and pathological processes.
  • Understanding blood flow mechanics within the microvasculature is essential for diagnosing and treating vascular diseases.

Purpose of the Study:

  • To review major experimental and theoretical studies on microcirculation and hemorheology.
  • To focus on the mechanics of blood flow and the vascular wall.
  • To discuss the regulation and adaptation of the microvasculature.

Main Methods:

  • Review of experimental and theoretical studies.
  • Analysis of blood flow dynamics in microvessels.
  • Examination of cellular rheology and vascular interactions.

Main Results:

  • Detailed discussion of blood formed elements (red blood cells, white blood cells, platelets) flow in microvessels.
  • Review of mechanical and rheological properties of blood cells and their interaction with the vascular wall.
  • Exploration of short-term and long-term regulation mechanisms, including metabolic, myogenic, and shear-stress-dependent processes, as well as angiogenesis and vascular remodeling.

Conclusions:

  • The mechanics of blood flow and cellular interactions are central to microcirculation.
  • Vascular wall properties and regulatory mechanisms significantly influence hemorheology.
  • Adaptation processes like angiogenesis and remodeling are key to microvascular function.