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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

6.8K
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

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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Acute Inflammation I: Inflammatory Response01:26

Acute Inflammation I: Inflammatory Response

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Acute inflammation is a rapid, short-lived physiological response to tissue injury or infection, designed to eliminate harmful agents and initiate repair. This tightly regulated process typically lasts from minutes to several days and is triggered by factors such as microbial invasion, physical trauma, or chemical injury.Recognition and Mediator ReleaseThe inflammatory response begins when resident immune cells—such as mast cells, macrophages, and dendritic cells—detect...
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Inflammation01:38

Inflammation

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Overview
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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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Acute Inflammation II: Local and Systemic Effects01:25

Acute Inflammation II: Local and Systemic Effects

45
Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Related Experiment Video

Updated: Apr 25, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
05:43

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers

Published on: November 8, 2024

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Platelet effector functions in inflammation.

Raphael Escaig1,2, Lennart Kreutz1,2, Rainer Kaiser1,2

  • 1Medizinische Klinik und Poliklinik I, University Hospital Ludwig-Maximilian University, Munich, Germany.

Research and Practice in Thrombosis and Haemostasis
|April 24, 2026
PubMed
Summary

Platelets are key immune cells that help control inflammation and prevent bleeding by migrating to injury sites. Their functions shift over time, impacting immunity and thrombosis risk.

Keywords:
immunothrombosisplateletsprocoagulantthromboinflammationthrombosis

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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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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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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Related Experiment Videos

Last Updated: Apr 25, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers

Published on: November 8, 2024

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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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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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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Area of Science:

  • Immunology
  • Hematology
  • Cellular Biology

Background:

  • Platelets are increasingly recognized as crucial regulators of innate and adaptive immunity.
  • Their role extends beyond hemostasis to active participation in inflammatory processes.

Conclusions:

  • Platelets are multifaceted immune cells with critical roles in inflammation and immunity.
  • Understanding platelet effector functions is vital for addressing hyperinflammation, immunopathology, and thrombotic disorders.
  • Platelet biology presents evolving therapeutic targets for inflammatory and thrombotic diseases.