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Related Concept Videos

Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
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...
Overview of Exosomes01:36

Overview of Exosomes

Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

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Related Experiment Video

Updated: May 17, 2026

Isolation and Analysis of Traceable and Functionalized Extracellular Vesicles from the Plasma and Solid Tissues
09:57

Isolation and Analysis of Traceable and Functionalized Extracellular Vesicles from the Plasma and Solid Tissues

Published on: October 17, 2022

Extracellular Vesicles in Hemostasis.

Marwa Mostageer1, Viktoria Weber1, Tanja Eichhorn1

  • 1Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500 Krems, Austria.

Clinics in Laboratory Medicine
|May 15, 2026
PubMed
Summary
This summary is machine-generated.

Extracellular vesicles (EVs) significantly impact blood clotting and thrombosis. Studying these tiny cell fragments offers new ways to diagnose and manage clotting disorders.

Keywords:
CoagulationExtracellular vesiclesHemostasisThrombosisTissue factor

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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

Published on: August 4, 2023

Extracellular Vesicle Tissue Factor Activity Assay
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Extracellular Vesicle Tissue Factor Activity Assay

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Last Updated: May 17, 2026

Isolation and Analysis of Traceable and Functionalized Extracellular Vesicles from the Plasma and Solid Tissues
09:57

Isolation and Analysis of Traceable and Functionalized Extracellular Vesicles from the Plasma and Solid Tissues

Published on: October 17, 2022

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
04:56

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

Published on: August 4, 2023

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Area of Science:

  • Biochemistry
  • Hematology
  • Cell Biology

Background:

  • Extracellular vesicles (EVs) play a crucial role in regulating hemostasis.
  • EVs influence coagulation through phosphatidylserine and tissue factor exposure.
  • Increased EV levels are linked to thrombotic risk in various diseases.

Purpose of the Study:

  • To review the role of distinct circulating EV subpopulations in hemostasis and thrombosis.
  • To highlight the potential of EVs as diagnostic and monitoring biomarkers for thrombotic disorders.

Main Methods:

  • Literature review of studies on extracellular vesicles and hemostasis.
  • Analysis of EV subpopulations and their procoagulant mechanisms.
  • Evaluation of EV-based biomarkers in thrombotic conditions.

Main Results:

  • Specific EV subpopulations differentially modulate hemostasis.
  • EVs promote coagulation via phosphatidylserine and tissue factor.
  • Circulating EV levels correlate with thrombotic risk.

Conclusions:

  • EVs are critical regulators of hemostasis and thrombosis.
  • Understanding EV subpopulations is key to comprehending thrombotic disorders.
  • EVs show promise as biomarkers for diagnosing and monitoring thrombotic diseases.