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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

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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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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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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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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

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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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Updated: Jun 9, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Back to basics: the coagulation pathway.

Seonyang Park1, Joo Kyung Park2

  • 1Department of Internal Medicine, Inje University Haeundae Paik Hospital, 875 Haeundae-Ro, Haeundae-Gu, Busan, 48108, Korea. seonpark@snu.ac.kr.

Blood Research
|October 28, 2024
PubMed
Summary
This summary is machine-generated.

The coagulation cascade involves initiation, amplification, and propagation steps. While the tissue factor pathway is crucial for initiating clotting, the contact activation system contributes to thrombosis but isn't essential for hemostasis.

Keywords:
CoagulationCoagulation pathwayHemostasis

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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:

  • Hematology
  • Biochemistry
  • Physiology

Background:

  • The classic coagulation cascade model has evolved, detailing intrinsic and extrinsic pathways.
  • Coagulation involves initiation by tissue factor (TF), amplification via the intrinsic tenase complex, and propagation on activated platelets.

Purpose of the Study:

  • To elucidate the intricate steps and components of the modified coagulation cascade.
  • To differentiate the roles of the tissue factor pathway and the contact activation system in hemostasis and thrombosis.

Main Methods:

  • Review and synthesis of established knowledge on coagulation pathways.
  • Analysis of the sequential activation of coagulation factors and complex formation.

Main Results:

  • TF-FVIIa initiates coagulation, forming thrombin via the prothrombinase complex (FXa-FVa).
  • The intrinsic tenase complex (FVIIIa-FIXa) amplifies thrombin generation significantly.
  • The contact activation system, initiated by FXII, contributes to thrombosis but is not vital for hemostasis.

Conclusions:

  • The coagulation cascade is a multi-step process involving distinct initiation, amplification, and propagation phases.
  • The contact activation pathway plays a role in thrombotic events, distinct from its necessity in primary hemostasis.