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Related Concept Videos

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.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
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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.
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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Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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Inflammation01:38

Inflammation

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Overview
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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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Updated: Feb 18, 2026

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Platelets as Modulators of Inflammation.

Seok-Joo Kim1, Rachelle P Davis1, Craig N Jenne1

  • 1Department of Microbiology, Immunology and Infectious Diseases, Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.

Seminars in Thrombosis and Hemostasis
|November 23, 2017
PubMed
Summary
This summary is machine-generated.

Platelets are key in hemostasis and immunity, fighting pathogens but potentially causing damage. Balancing platelet activity is crucial for health, especially in inflammation and disease.

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Area of Science:

  • Immunology
  • Hematology
  • Pathology

Background:

  • Platelets traditionally viewed as hemostasis effectors.
  • Emerging roles in innate and adaptive immunity.
  • Platelets mediate pathogen recognition and immune cell modulation.

Purpose of the Study:

  • Review current understanding of platelet inflammatory roles.
  • Highlight modulators linking inflammation and tissue damage.
  • Emphasize balancing platelet function in health and disease.

Main Methods:

  • Literature review of platelet function in immunity and inflammation.
  • Analysis of mediators released by activated platelets.
  • Discussion of pathological implications of excessive platelet activity.

Main Results:

  • Platelets actively participate in immune responses.
  • Platelet mediators influence immune and endothelial cells.
  • Excessive platelet activity contributes to inflammation-mediated tissue damage.

Conclusions:

  • Platelet function extends beyond hemostasis into critical immune roles.
  • Dysregulated platelet activity can drive disease pathogenesis.
  • Maintaining a balance between platelet hemostatic and inflammatory functions is vital.