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Related Concept Videos

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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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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Structure and Function of Platelets01:18

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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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Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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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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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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Related Experiment Video

Updated: Jan 19, 2026

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

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Platelets and Complement Cross-Talk in Early Atherogenesis.

Hugh Kim1,2,3, Edward M Conway1,4

  • 1Centre for Blood Research, Life Sciences Institute, University of British Columbia, Vancouver, BC, Canada.

Frontiers in Cardiovascular Medicine
|September 27, 2019
PubMed
Summary
This summary is machine-generated.

Platelets and complement system interactions promote early atherosclerosis development. This crosstalk contributes to inflammatory signaling, impacting atheroma formation and vascular inflammation.

Keywords:
atheromaatherosclerosiscomplementendotheliuminflammationinnate immunityplateletsvascular

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Area of Science:

  • Cardiovascular Research
  • Immunology
  • Vascular Biology

Background:

  • Atherosclerosis is a major health concern, involving inflammation and plaque formation.
  • Platelets are key in thrombosis but also contribute to early atheroma.
  • The complement system, part of innate immunity, plays a role in vascular inflammation.

Purpose of the Study:

  • To review the intricate relationship between platelets and the complement system.
  • To explore how their interaction influences the initiation of atheroma formation.

Main Methods:

  • Literature review and synthesis of existing research on platelet-complement interactions in atherosclerosis.

Main Results:

  • Platelets actively engage with complement system components.
  • This crosstalk has pro-inflammatory effects relevant to early atheroma development.

Conclusions:

  • The interplay between platelets and the complement system is a critical factor in initiating atherosclerosis.
  • Targeting this interaction may offer new therapeutic strategies for preventing atheroma formation.