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Related Concept Videos

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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Coagulation01:09

Coagulation

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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.
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...
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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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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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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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Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Related Experiment Video

Updated: Jun 25, 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

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The convergent model of coagulation.

Jun Yong1, Cheng-Hock Toh1

  • 1Department of Clinical Infection, Microbiology and Immunology, University of Liverpool, Liverpool, UK; The Roald Dahl Haemostasis and Thrombosis Centre, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK.

Journal of Thrombosis and Haemostasis : JTH
|May 30, 2024
PubMed
Summary

Immunothrombosis, the link between coagulation and immunity, requires a new model. This unified response to vascular injury, involving damage-associated molecular patterns, aids clot formation, resolution, and healing, offering new therapeutic avenues.

Keywords:
coagulationdamage-associated molecular patternshistonesinnate immunityneutrophil extracellular trapsthrombin

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Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization
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A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium
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A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium

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Related Experiment Videos

Last Updated: Jun 25, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium
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Area of Science:

  • Coagulation and Innate Immunity
  • Vascular Biology
  • Immunothrombosis

Background:

  • Conventional coagulation models fail to explain complex challenges like immunothrombosis.
  • The pathologic interplay between coagulation and innate immunity is a shared mechanism in various medical conditions.
  • Understanding this interplay is crucial for addressing contemporary medical challenges.

Purpose of the Study:

  • To propose a unified model of coagulation that integrates inflammation and innate immune activation.
  • To elucidate the role of damage-associated molecular patterns in vascular injury response.
  • To extend the understanding of coagulation beyond traditional concepts for novel applications.

Main Methods:

  • Conceptual model development integrating coagulation, inflammation, and innate immunity.
  • Analysis of the role of damage-associated molecular patterns in vascular injury.
  • Review of existing literature and clinical observations, including COVID-19 and vaccine-induced immune thrombotic thrombocytopenia.

Main Results:

  • A convergent model of coagulation is proposed, unifying it with inflammation and innate immunity as a response to vascular injury.
  • Damage-associated molecular patterns are identified as key evolutionary components facilitating clot formation, resolution, and healing.
  • The model provides a framework for understanding conditions like COVID-19 and vaccine-induced immune thrombotic thrombocytopenia.

Conclusions:

  • The proposed convergent model offers a more comprehensive understanding of coagulation's role in vascular injury.
  • This framework can lead to the development of novel diagnostics and therapeutics for complex medical conditions.
  • Recognizing immunothrombosis as a unified response is critical for advancing medical interventions.