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Related Concept Videos

Blood Flow01:29

Blood Flow

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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.
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Autoregulation of Blood Flow01:17

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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.
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Vascular Resistance01:20

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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.
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Blood Pressure01:24

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The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
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Disorders of Hemostasis01:24

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
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Characteristics and Functions of Blood01:26

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Blood is specialized connective tissue comprising about 8% of the body mass. It has a thick, liquid extracellular matrix that contains cells, dissolved proteins, and electrolytes, making it five times more viscous than water. Blood is warm, around 38°C, and has an alkaline pH ranging from 7.35 to 7.45.
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Related Experiment Video

Updated: Jul 7, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Blood Rheology and Hemodynamics.

Oguz K Baskurt1, Herbert J Meiselman2

  • 1Department of Physiology, Akdeniz University Faculty of Medicine, Antalya, Türkiye.

Seminars in Thrombosis and Hemostasis
|December 20, 2023
PubMed
Summary
This summary is machine-generated.

Blood viscosity is determined by red blood cell (RBC) properties and aggregation, which are crucial for blood flow. Alterations in these factors can impair tissue perfusion and lead to functional deterioration in various diseases.

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Last Updated: Jul 7, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Area of Science:

  • * Hematology and Hemorheology: Focuses on the physical properties of blood and their clinical implications.
  • * Cardiovascular Physiology: Explores blood flow dynamics and tissue perfusion.

Background:

  • * Blood is a non-Newtonian fluid whose apparent viscosity depends on shear forces, hematocrit, plasma viscosity, red blood cell (RBC) aggregation, and RBC mechanical properties.
  • * RBC deformability is critical for blood flow, especially in microcirculation, and is influenced by membrane properties, cell morphology, and cytoplasmic viscosity.
  • * RBC aggregation, a reversible process influenced by shear forces, significantly impacts blood fluidity, particularly in low-flow conditions.

Purpose of the Study:

  • * To highlight the most highly cited paper in *Seminars in Thrombosis and Hemostasis* (STH) on blood rheology.
  • * To review the determinants of blood viscosity, including hematocrit, plasma viscosity, RBC aggregation, and RBC mechanical properties.
  • * To discuss the impact of altered blood rheology in various physiopathological conditions.

Main Methods:

  • * Review of fundamental principles of blood rheology and its determinants.
  • * Analysis of factors affecting red blood cell (RBC) deformability and aggregation.
  • * Examination of the relationship between blood rheology and disease states.

Main Results:

  • * Blood viscosity is a complex interplay of cellular and plasma factors, with RBC deformability and aggregation being key determinants.
  • * Altered hematocrit, impaired RBC deformability (due to genetic disorders or environmental factors), and increased RBC aggregation (often linked to inflammation) significantly affect blood fluidity.
  • * Changes in blood rheology can lead to impaired tissue perfusion and functional deterioration, particularly when vascular properties are also compromised.

Conclusions:

  • * Understanding blood rheology, particularly the behavior of red blood cells, is essential for comprehending normal physiology and pathophysiology.
  • * Deviations in blood viscosity, driven by factors like altered RBC aggregation and deformability, are implicated in various disease processes.
  • * Impaired blood fluidity poses a significant risk to tissue perfusion and organ function.