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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.
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.
Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance vessels. When...
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
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...

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Related Experiment Video

Updated: Jun 26, 2026

Controlled Reversible Visceral Arterial Ischemia, Venous Congestion and Combined Malperfusion via Midline Laparotomy in Rats
04:57

Controlled Reversible Visceral Arterial Ischemia, Venous Congestion and Combined Malperfusion via Midline Laparotomy in Rats

Published on: July 5, 2024

Blood viscosity modulates tissue perfusion: sometimes and somewhere.

C Lenz1, A Rebel, K F Waschke

  • 1Clinic of Anesthesiology and Critical Care Medicine, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Germany.

Transfusion Alternatives in Transfusion Medicine : TATM
|January 6, 2009
PubMed
Summary

Blood viscosity plays a minor role in microvascular perfusion when autoregulation is effective. However, elevated blood viscosity should be avoided in pathological conditions where autoregulation fails, as risks outweigh benefits.

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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

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In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling
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In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling

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Last Updated: Jun 26, 2026

Controlled Reversible Visceral Arterial Ischemia, Venous Congestion and Combined Malperfusion via Midline Laparotomy in Rats
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Published on: July 5, 2024

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

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In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling
07:30

In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling

Published on: November 3, 2015

Area of Science:

  • Physiology
  • Critical Care Medicine
  • Fluid Dynamics

Background:

  • Organ-specific microvascular perfusion is crucial for targeted therapies.
  • Blood viscosity's role in transfusion fluid design is often underestimated.
  • Viscosity is rarely monitored in critical care.

Purpose of the Study:

  • To evaluate the significance of blood viscosity in microvascular perfusion.
  • To explore the implications of blood viscosity in transfusion fluid design.
  • To assess the risks and benefits of therapeutic viscosity correction.

Main Methods:

  • Review of studies linking viscosity-dependent microvascular perfusion to outcomes.
  • Analysis of physiological conditions where autoregulation is effective.
  • Examination of pathological conditions with impaired autoregulation.

Main Results:

  • Whole blood viscosity is negligible in effective autoregulation.
  • The body compensates for viscosity changes to maintain oxygen delivery.
  • Increased viscosity is detrimental when autoregulation is impaired.

Conclusions:

  • Therapeutic correction of blood viscosity carries risks that outweigh benefits due to uncertainty in identifying impaired autoregulation.
  • Bedside monitoring of blood viscosity is needed for evidence-based clinical management.