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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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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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Amyloid Fibrils03:03

Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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Disorders of Hemostasis01:24

Disorders of Hemostasis

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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
Two factors primarily cause thromboembolic conditions.
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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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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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Related Experiment Video

Updated: Jun 26, 2025

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

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Fibrinogen: Structure, abnormalities and laboratory assays.

Berrak Güven1, Murat Can1

  • 1Department of Clinical Biochemistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.

Advances in Clinical Chemistry
|May 18, 2024
PubMed
Summary

Fibrinogen, a key protein in blood clotting, plays a crucial role in hemostasis. Understanding its structure and function is vital for managing bleeding and thrombosis risks.

Area of Science:

  • Biochemistry
  • Hematology

Background:

  • Fibrinogen is the main precursor to fibrin clots in blood coagulation.
  • It acts as an acute phase reactant, changing with inflammation and physiological states.
  • Abnormalities in fibrinogen levels or function correlate with bleeding and thrombotic risks.

Purpose of the Study:

  • To explore the structure and function of fibrinogen.
  • To detail fibrinogen's role in hemostasis and bleeding disorders.
  • To discuss fibrinogen measurement for clinical management.

Main Methods:

  • Literature review of fibrinogen's structure and function.
  • Analysis of fibrinogen's involvement in hemostasis and pathology.
  • Examination of clinical assays for fibrinogen.

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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy

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Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
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Related Experiment Videos

Last Updated: Jun 26, 2025

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

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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy

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Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
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Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

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Main Results:

  • Fibrinogen's structure facilitates fibrin clot formation.
  • Fibrinogen levels and function are critical indicators in hemostasis.
  • Fibrinogen assays are essential tools in clinical practice.

Conclusions:

  • Fibrinogen is central to blood clotting and hemostasis.
  • Its measurement is key for diagnosing and managing bleeding and thrombotic conditions.