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Related Concept Videos

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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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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Introduction to Hemostasis01:05

Introduction to Hemostasis

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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.
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,...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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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Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

1.5K
Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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Related Experiment Video

Updated: Mar 26, 2026

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

Published on: February 14, 2017

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Polyphosphate as a haemostatic modulator.

Nicola J Mutch1

  • 1Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, U.K. n.j.mutch@abdn.ac.uk.

Biochemical Society Transactions
|February 11, 2016
PubMed
Summary

Platelet polyphosphate (polyP) released from dense granules significantly enhances blood clot formation and stability. This discovery highlights polyP

Area of Science:

  • Biochemistry
  • Hematology
  • Cell Biology

Background:

  • Platelets are crucial for hemostasis, releasing granular contents upon activation.
  • Dense granules contain polyphosphate (polyP) and other biomolecules vital for hemostasis.
  • Platelet polyP is a linear polymer of 60-100 phosphate monomers.

Purpose of the Study:

  • To elucidate the role of platelet-derived polyphosphate (polyP) in hemostasis.
  • To investigate how polyP modulates coagulation and fibrinolysis.

Main Methods:

  • The study focuses on the biochemical properties and functional effects of platelet polyP.
  • Analysis of polyP's interaction with the contact system and coagulation cascade factors.
  • Assessment of polyP's impact on fibrin network structure and stability.
Keywords:
coagulationfibrinfibrinolysishaemostasisplateletspolyphosphate

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Related Experiment Videos

Last Updated: Mar 26, 2026

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

  • Platelet polyP activates the contact system due to its anionic nature.
  • PolyP accelerates thrombin generation and enhances fibrin formation and platelet activation.
  • Incorporation of polyP into fibrin clots modifies clot structure and stability.

Conclusions:

  • Platelet polyP release at injury sites promotes clot formation and stability.
  • PolyP plays a significant role in augmenting the hemostatic response.
  • This suggests polyP as a key factor in wound healing and thrombosis.