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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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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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Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

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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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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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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: Feb 27, 2026

Microfluidics in Assessing Platelet Function
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Microfluidics in Assessing Platelet Function

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Normal platelet function.

Michael Holinstat1,2

  • 1Department of Pharmacology, University of Michigan, 1150 West Medical Center Drive, 2220D MSRB III, Ann Arbor, MI, 48109-5632, USA. mholinst@umich.edu.

Cancer Metastasis Reviews
|July 2, 2017
PubMed
Summary

Platelets are key regulators of hemostasis and thrombosis, crucial for blood clot formation after vascular injury. These versatile cells also impact innate immunity and tumor growth.

Keywords:
BleedingCardiovascular diseaseHemostasisImmunitySignal transductionThrombosis

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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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Area of Science:

  • Hematology
  • Vascular Biology
  • Immunology

Background:

  • Platelets are circulating blood cells derived from megakaryocytes, with a lifespan of 5-7 days.
  • Their primary role involves regulating hemostasis and thrombosis, essential for preventing excessive bleeding.
  • Platelets are critical in the process of clot formation following vascular injury.

Purpose of the Study:

  • To elucidate the multifaceted roles of platelets in vascular health and disease.
  • To highlight platelets' functions beyond hemostasis, including immunity and cancer biology.
  • To underscore the significance of platelets as therapeutic targets.

Main Methods:

  • Review of established literature on platelet biology and function.
  • Analysis of platelet activation pathways and their consequences.
  • Examination of platelet involvement in pathological conditions.

Main Results:

  • Platelet activation leads to adhesion, aggregation, and thrombus formation.
  • Pathological platelet activity contributes to occlusive arterial thrombus formation.
  • Platelets are implicated in innate immunity and the regulation of tumor growth and metastasis.

Conclusions:

  • Platelets are essential for hemostasis and thrombosis, forming the primary target for arterial thrombus prevention.
  • Beyond hemostasis, platelets exhibit significant roles in innate immunity and cancer progression.
  • The diverse functions of platelets highlight their versatility and importance in circulation.