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Related Concept Videos

Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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 forms a...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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.
Coagulation01:09

Coagulation

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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

Updated: May 17, 2026

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

Fibrin polymerization in blood coagulation-a statistical model.

Gilead Moiseyev1, Sefi Givli, Pinhas Z Bar-Yoseph

  • 1Biomechanics Center of Excellence, Technion-Israel Institute of Technology, Haifa 32000, Israel. gileadm@tx.technion.ac.il

Journal of Biomechanics
|November 6, 2012
PubMed
Summary

A new theoretical model explains fibrin clot formation using polymerization statistics. It accurately predicts clot mechanics influenced by thrombin, plasmin, and shear rate without fitting parameters.

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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
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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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Tracking Fibrinolysis of Chandler Loop-Formed Whole Blood Clots Under Shear Flow in An In-Vitro Thrombolysis Model
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Tracking Fibrinolysis of Chandler Loop-Formed Whole Blood Clots Under Shear Flow in An In-Vitro Thrombolysis Model

Published on: April 19, 2024

Area of Science:

  • Biophysics
  • Biomaterials Science
  • Computational Biology

Background:

  • Fibrin clot formation is a complex process crucial for hemostasis.
  • Understanding the factors influencing clot structure and mechanics is vital for treating bleeding disorders and thrombosis.
  • Existing models may lack predictive power or rely on empirical fitting.

Purpose of the Study:

  • To develop a novel theoretical model for fibrin clot growth based on polymerization principles.
  • To investigate the influence of key physiological factors (thrombin, plasmin, shear rate) on clot mechanics.
  • To validate the model against experimental data without using fitting parameters.

Main Methods:

  • Statistical description of fibrin polymer network formation.
  • Incorporation of thrombin concentration, plasmin concentration, and local shear rate as model inputs.
  • Numerical simulations to predict clot properties and mechanical behavior.

Main Results:

  • The model successfully describes fibrin clot growth dynamics.
  • It accurately predicts the mechanical properties of clots under varying conditions.
  • Model predictions align well with experimental observations, both quantitatively and qualitatively.

Conclusions:

  • The derived theoretical model provides fundamental insights into fibrin clot formation.
  • It highlights the critical roles of thrombin, plasmin, and shear rate in regulating clot mechanics.
  • The model's predictive accuracy and use of experimentally validated parameters offer a robust framework for future research.