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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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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.
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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Coagulation01:09

Coagulation

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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.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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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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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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Related Experiment Video

Updated: Mar 12, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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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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Platelets: essential components of the immune system.

Ramadan A Ali1, Leah M Wuescher1, Randall G Worth1

  • 1Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, OH 43614, USA.

Current Trends in Immunology
|November 8, 2016
PubMed
Summary

Platelets, traditionally known for blood clotting, are increasingly recognized for their crucial roles in the immune system. This review highlights their involvement in innate and adaptive immunity, positioning them as key immune orchestrators.

Keywords:
adaptive immunityhemostasisinnate immunityplatelets

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Microfluidics in Assessing Platelet Function
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Related Experiment Videos

Last Updated: Mar 12, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Microfluidics in Assessing Platelet Function
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • Platelets are anucleate cell fragments primarily associated with hemostasis and thrombosis.
  • Emerging evidence reveals platelets possess significant immunological functions beyond coagulation.
  • Their role in immunity is often underestimated, despite substantial contributions.

Purpose of the Study:

  • To review and synthesize recent and historical evidence on platelet involvement in immunological processes.
  • To highlight platelets' multifaceted roles in both innate and adaptive immunity.
  • To reframe the understanding of platelets as critical orchestrators of the immune system.

Main Methods:

  • Literature review of recent and historical scientific publications.
  • Analysis of studies investigating platelet interactions with immune cells and pathogens.
  • Synthesis of evidence from diverse immunological contexts.

Main Results:

  • Platelets actively participate in combating microbial threats.
  • They play a role in recruiting and activating innate immune cells.
  • Platelets modulate antigen presentation and enhance adaptive immune responses.

Conclusions:

  • Platelets are integral components of the immune system, influencing both innate and adaptive immunity.
  • Their functions extend significantly beyond hemostasis and thrombosis.
  • Platelets should be recognized as central orchestrators in immune system regulation.