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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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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.
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,...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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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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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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.
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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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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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.
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Differentiation of Common Myeloid Progenitor Cells01:15

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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Related Experiment Video

Updated: Mar 17, 2026

Simultaneous Study of the Recruitment of Monocyte Subpopulations Under Flow In Vitro
09:16

Simultaneous Study of the Recruitment of Monocyte Subpopulations Under Flow In Vitro

Published on: November 26, 2018

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Monocyte and Haemostasis.

M Broussas1, P Cornillet-Lefebvre1, G Potron1

  • 1a Laboratoire central d'Hématologie , Hôpital Robert Debré , Reims , France.

Hematology (Amsterdam, Netherlands)
|July 15, 2016
PubMed
Summary
This summary is machine-generated.

Monocytes are crucial for hemostasis beyond just tissue factor (TF) expression. They provide procoagulant surfaces and express inhibitors, highlighting their complex role in blood coagulation.

Keywords:
Monocytesanionic phospholipidshemostasistissue factortissue factor pathway inhibitor

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Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Monocytes are known to express tissue factor (TF), initiating the extrinsic coagulation pathway.
  • Their role in hemostasis may extend beyond TF-dependent mechanisms.

Purpose of the Study:

  • To review the multifaceted roles of monocytes in hemostasis, independent of TF expression.
  • To highlight TF-independent procoagulant and anticoagulant functions of monocytes.

Main Methods:

  • Literature review focusing on monocyte-associated procoagulant activities.
  • Analysis of monocyte surface receptors and expressed factors involved in coagulation.
  • Examination of monocytic proteases and inhibitors in hemostasis.

Main Results:

  • Monocytes provide anionic phospholipid surfaces that support coagulation factor activation.
  • Receptors like EPR-1, Mac-1, and membrane factor Va facilitate factor X/Xa binding.
  • Monocytes express TFPI, a key inhibitor of TF activity, suggesting regulatory roles.

Conclusions:

  • Monocytes actively participate in hemostasis through TF-dependent and TF-independent pathways.
  • Their involvement in coagulation regulation warrants further investigation in thrombotic disorders.
  • Future research should consider broader monocyte functions beyond TF expression in vascular diseases.