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Related Concept Videos

Formation of the Platelet Plug01:22

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

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.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
Introduction to Hemostasis01:05

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.
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, and...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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.
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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: May 30, 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

How platelets safeguard vascular integrity.

B Ho-Tin-Noé1, M Demers, D D Wagner

  • 1Immune Disease Institute, Boston, MA 02115, USA.

Journal of Thrombosis and Haemostasis : JTH
|July 26, 2011
PubMed
Summary
This summary is machine-generated.

Platelets maintain blood vessel integrity beyond clotting. Modulating these functions may treat bleeding and enhance cancer drug delivery.

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Microfluidics in Assessing Platelet Function
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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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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Related Experiment Videos

Last Updated: May 30, 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

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
11:42

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Area of Science:

  • Hematology
  • Vascular Biology
  • Cell Biology

Background:

  • Platelets' role in hemostasis (stopping bleeding) is well-established since the 1880s.
  • Platelets also support the structural integrity and barrier function of intact blood vessels.
  • Recent findings show platelets safeguard developing vessels, lymphatics, and microvasculature in inflammation and tumors.

Purpose of the Study:

  • To review nonconventional platelet functions in maintaining vascular integrity.
  • To discuss the mechanisms behind these newly described platelet roles.
  • To explore therapeutic potential in hemorrhage and cancer treatment.

Main Methods:

  • Literature review of studies on platelet functions beyond hemostasis.
  • Analysis of mechanisms involving platelet granule secretion.
  • Discussion of implications for vascular health and disease.

Main Results:

  • Platelets actively support mature and developing blood vessels, lymphatics, and microvasculature.
  • Vascular support often relies on secreted platelet granule contents, not clot formation.
  • Platelets play roles in inflamed tissues and tumors, safeguarding vessels.

Conclusions:

  • Platelets have critical, non-hemostatic functions in maintaining vascular integrity.
  • Understanding these roles opens new therapeutic avenues.
  • Targeting these platelet functions could improve treatments for bleeding disorders and cancer therapy.