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Related Concept Videos

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...
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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...
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 Articles

Articles linked to this work by shared authors, journal, and citation graph.

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The function of ultra-large von Willebrand factor multimers in high shear flow controlled by ADAMTS13.

Hamostaseologie·2015
Same author

The EPIC study: a lesson to learn.

Haemophilia : the official journal of the World Federation of Hemophilia·2015
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Recombinant full-length factor VIII (FVIII) and extended half-life FVIII products in prophylaxis--new insight provided by pharmacokinetic modelling.

Haemophilia : the official journal of the World Federation of Hemophilia·2015
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Flow-dependent thrombin and fibrin generation in vitro: opportunities for standardization: communication from SSC of the ISTH.

Journal of thrombosis and haemostasis : JTH·2013
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The principles of PK-tailored prophylaxis.

Hamostaseologie·2013
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Development of novel treatment options for patients with haemophilia.

Hamostaseologie·2013
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Related Experiment Video

Updated: Jul 10, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

[Coagulation activity of platelets].

A J Reininger1

  • 1Labor für Immungenetik und Molekulare Diagnostik, Abt. Transfusionsmedizin und Hämostaseologie, Klinikum der Universität München, Max-Lebsche-Platz 32, 81377 München.

Hamostaseologie
|October 17, 2007
PubMed
Summary

Platelets initiate blood clot formation by adhering to injured vessels and recruiting more platelets. They accelerate clotting through procoagulant surfaces and tissue factor, crucial for haemostasis and thrombosis.

Area of Science:

  • Hematology
  • Biochemistry
  • Cell Biology

Context:

  • Haemostasis prevents blood loss after injury, while thrombosis involves aberrant clotting at diseased vessel walls.
  • Platelets are central to both processes, interacting with the vessel wall and other blood components.

Purpose:

  • To elucidate the role of platelets and platelet-derived microparticles in initiating and accelerating haemostasis.
  • To detail the molecular mechanisms of platelet adhesion, aggregation, and their contribution to clot formation.

Summary:

  • Platelets adhere to injured endothelium via glycoprotein (GP) Ibalpha binding to von Willebrand factor (VWF), followed by aggregation mediated by fibrinogen and integrin alphaIIbbeta3.
  • Activated platelets provide procoagulant surfaces and express tissue factor, significantly accelerating fibrin polymerization and clot stabilization.

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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

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
05:49

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

Related Experiment Videos

Last Updated: Jul 10, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

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

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
05:49

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

  • Platelet-derived microparticles generated under shear stress also contribute to shortened clotting times, highlighting their haemostatic role.

    • Impact:

    • Understanding these platelet functions is critical for developing targeted therapies for bleeding disorders and thrombotic diseases.
    • This research underscores the pivotal role of platelets in haemostasis, from initial injury response to the acceleration of clot formation.