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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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 platelets, with...
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Formation of the Platelet Plug

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 Hemostasis

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

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.
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Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
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Updated: May 25, 2026

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Inside platelets...

Robert K Andrews1, Elizabeth E Gardiner

  • 1Monash University.

Blood
|January 28, 2012
PubMed
Summary
This summary is machine-generated.

Deleting RhoA in mouse platelets causes larger platelets and bleeding issues, yet surprisingly protects against blood clots and stroke. This reveals new roles for RhoA in platelet function and disease.

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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: May 25, 2026

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
05:49

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

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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:

  • Hematology
  • Molecular Biology
  • Thrombosis Research

Background:

  • The GTPase family member RhoA plays a role in cellular processes.
  • Megakaryocytes and platelets are crucial for hemostasis and thrombosis.

Discussion:

  • Deletion of RhoA in murine megakaryocytes/platelets leads to macrothrombocytopenia.
  • Despite macrothrombocytopenia, RhoA deficiency confers protection against occlusive thrombosis and cerebral infarction.

Key Insights:

  • RhoA is essential for normal platelet production and function.
  • RhoA signaling in platelets has a dual role in thrombosis, promoting clot formation while also potentially contributing to pathological occlusion.

Outlook:

  • Further investigation into RhoA's complex role in platelet biology is warranted.
  • Targeting RhoA pathways could offer novel therapeutic strategies for platelet-related disorders and thrombotic diseases.