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Related Concept Videos

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.
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...
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...
Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
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...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...

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Related Experiment Video

Updated: Jun 5, 2026

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Tissue factor-bearing microparticles and thrombus formation.

Jeffrey I Zwicker1, Cameron C Trenor, Barbara C Furie

  • 1Division of Hemostasis, Harvard Medical School, Thrombosis Beth Israel Deaconess Medical Center, 330 Brookline Ave E/CLS 903, Boston, MA 02215, USA.

Arteriosclerosis, Thrombosis, and Vascular Biology
|January 22, 2011
PubMed
Summary

Blood microparticles are tiny cell fragments found in blood, originating from various blood and vessel wall cells. These particles carry important molecular information from their parent cells, offering insights into health and disease states.

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Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
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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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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Last Updated: Jun 5, 2026

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
10:08

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Published on: November 22, 2024

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

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

Published on: February 14, 2017

Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Blood microparticles are nanoscale vesicles released from circulating and endothelial cells.
  • They retain surface markers and internal contents (RNA, proteins) of their parent cells.
  • Microparticles originate from platelets, immune cells, endothelial cells, smooth muscle cells, and tumor cells.

Purpose of the Study:

  • To define the origin and characteristics of blood microparticles.
  • To highlight their potential as biomarkers in various diseases.

Main Methods:

  • Characterization of microparticles based on size (100-1000 nm).
  • Analysis of surface protein expression to determine cell origin.
  • Assessment of retained cytosolic content, including RNA.

Main Results:

  • Blood microparticles are heterogeneous, derived from multiple cell types.
  • Surface protein analysis confirms origins from platelets, granulocytes, monocytes, endothelial cells, smooth muscle cells, and tumor cells.
  • A subset of microparticles expresses tissue factor, a key procoagulant protein.

Conclusions:

  • Blood microparticles are significant biological structures with diverse cellular origins.
  • Their molecular cargo and surface markers offer potential for diagnostic and prognostic applications.
  • Further research into specific microparticle subpopulations, like those expressing tissue factor, is warranted.