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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

6.7K
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

Structure and Function of Platelets

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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.
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...
1.3K
Introduction to Hemostasis01:05

Introduction to Hemostasis

8.4K
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,...
8.4K
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...
7.2K
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

6.5K
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.
6.5K
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

8.4K
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...
8.4K

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Related Experiment Video

Updated: Jul 26, 2025

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

964

Sepsis - it is all about the platelets.

Dermot Cox1

  • 1School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland.

Frontiers in Immunology
|June 23, 2023
PubMed
Summary

Sepsis causes low platelet counts (thrombocytopenia), linked to mortality. Pathogen-induced platelet activation may drive sepsis-related clotting disorders and organ failure, suggesting anti-platelet therapies could help.

Area of Science:

  • Hematology
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • Sepsis is frequently accompanied by thrombocytopenia, a condition characterized by low platelet counts.
  • The severity of thrombocytopenia in sepsis correlates with patient mortality.
  • This thrombocytopenia is a hallmark of sepsis-associated coagulopathy, specifically disseminated intravascular coagulation (DIC).

Purpose of the Study:

  • To review the mechanisms by which pathogens activate platelets during sepsis.
  • To examine the evidence supporting the use of anti-platelet agents in managing sepsis.
  • To understand the role of platelet activation in sepsis-induced DIC and multi-organ failure.

Main Methods:

  • Literature review of studies on pathogen-platelet interactions in sepsis.
Keywords:
anti-platelet agentsinnate immunityplateletssepsisthrombosis

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  • Analysis of research on the pathogenesis of sepsis-associated coagulopathy.
  • Evaluation of clinical and preclinical data on anti-platelet therapies in sepsis models.

    • Main Results:

    • Many bacterial and viral pathogens directly activate platelets.
    • Pathogen-induced platelet activation contributes to systemic thrombosis.
    • This process is implicated in driving the multi-organ failure characteristic of DIC in sepsis.

    Conclusions:

    • Pathogen-mediated platelet activation is a key mechanism in sepsis-induced DIC.
    • Anti-platelet agents represent a potential therapeutic strategy for sepsis management.
    • Further research is warranted to validate the efficacy of anti-platelet therapies in clinical sepsis settings.