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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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Disorders of Hemostasis01:24

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
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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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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

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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.
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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.
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Related Experiment Video

Updated: Jan 8, 2026

Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
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Potential Mechanisms Underlying Bleeding During Infection With Hemorrhagic Fever Viruses.

Megan V Perkins1,2, Nigel Mackman2

  • 1Department of Microbiology and Immunology (M.V.P.), University of North Carolina at Chapel Hill.

Arteriosclerosis, Thrombosis, and Vascular Biology
|December 18, 2025
PubMed
Summary

Viral hemorrhagic fever (VHF) is increasing globally. This review explores VHF

Keywords:
coagulationplateletstissue factorvascular permeabilityviral hemorrhagic fever

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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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Area of Science:

  • * Virology and infectious diseases.
  • * Hematology and hemostasis.
  • * Pathophysiology of viral infections.

Background:

  • * Viral hemorrhagic fever (VHF) encompasses diverse diseases caused by viruses from six families.
  • * VHF incidence is rising due to expanded vector ranges and increased host-pathogen interactions.
  • * Bleeding is a hallmark of VHF, stemming from viral effects on the hemostatic system.

Purpose of the Study:

  • * To review and discuss the potential mechanisms of bleeding in viral hemorrhagic fevers.
  • * To highlight common and distinct bleeding pathways across different VHF types.
  • * To identify knowledge gaps and areas for future research.

Main Methods:

  • * Literature review of studies investigating bleeding mechanisms in VHF.
  • * Analysis of data from human and nonhuman primate models of VHF.
  • * Examination of hemostatic parameters and biomarkers in VHF patients.

Main Results:

  • * VHF involves dysregulation of the hemostatic system through direct viral effects and host responses.
  • * Mechanisms include consumptive coagulopathy, reduced coagulation factors, thrombocytopenia, platelet dysfunction, and endothelial damage.
  • * Specific examples include increased tissue factor in Ebola virus infection and thrombocytopenia in dengue virus infection.

Conclusions:

  • * Bleeding in VHF results from a complex interplay of factors affecting coagulation and vascular integrity.
  • * Understanding these mechanisms is crucial for managing VHF patients.
  • * Further research is needed to elucidate the precise pathways and develop targeted therapies.