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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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...
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Structure and Function of Platelets01:18

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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.
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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.
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Introduction to Hemostasis01:05

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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.
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Clot Retraction and Fibrinolysis01:16

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

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Lipid specificity of the membrane binding domain of coagulation factor X.

Journal of thrombosis and haemostasis : JTH·2017
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Polyphosphate as modulator of hemostasis, thrombosis, and inflammation.

Journal of thrombosis and haemostasis : JTH·2015
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Factor XI anion-binding sites are required for productive interactions with polyphosphate.

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Factor XII promotes blood coagulation independent of factor XI in the presence of long-chain polyphosphates.

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Related Experiment Video

Updated: Apr 12, 2026

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

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Polyphosphate, platelets, and coagulation.

R J Travers1, S A Smith1, J H Morrissey1

  • 1Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL, USA.

International Journal of Laboratory Hematology
|May 16, 2015
PubMed
Summary
This summary is machine-generated.

Platelet polyphosphate plays a complex role in blood clotting, immune responses, and inflammation. New research explores its function and potential therapeutic applications in hemostasis and thrombosis.

Keywords:
Polyphosphatecoagulationhemostasisplateletsthrombosis

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Last Updated: Apr 12, 2026

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Area of Science:

  • Biochemistry
  • Immunology
  • Hematology

Background:

  • The traditional blood coagulation cascade is increasingly understood to be more complex than previously thought.
  • New amplification pathways and connections between coagulation enzymes and the immune system have been identified.
  • Platelet polyphosphate, stored in dense granules and secreted upon activation, is a focus of recent research.

Purpose of the Study:

  • To review the complex role of platelet polyphosphate in hemostasis, thrombosis, and inflammation.
  • To discuss novel therapeutics targeting polyphosphate's functions in coagulation and inflammation.

Main Methods:

  • Review of recent scientific literature on platelet polyphosphate.
  • Analysis of its involvement in hemostasis, thrombosis, and inflammation.
  • Exploration of potential therapeutic strategies.

Main Results:

  • Platelet polyphosphate significantly contributes to hemostasis and thrombosis.
  • Polyphosphate has extensive connections with the immune system and inflammatory processes.
  • Its multifaceted roles necessitate a revised understanding of coagulation.

Conclusions:

  • Platelet polyphosphate is a key molecule with diverse roles in hemostasis, thrombosis, and inflammation.
  • Further research into polyphosphate's mechanisms can lead to novel therapeutic interventions.
  • Understanding these complex interactions is crucial for advancing treatments in coagulation and inflammatory diseases.