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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

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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Introduction to Hemostasis01:05

Introduction to Hemostasis

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

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

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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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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.
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Related Experiment Video

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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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Platelets are not just for clots.

James D McFadyen1, Zane S Kaplan1

  • 1Australian Centre for Blood Diseases, Monash University, Melbourne, Australia.

Transfusion Medicine Reviews
|February 15, 2015
PubMed
Summary
This summary is machine-generated.

Platelets are key mediators beyond blood clotting, playing significant roles in immune responses, inflammation, and cancer. This review details their nonhemostatic functions and involvement in various diseases.

Keywords:
CancerInflammationLeukocytesPlateletsThrombosis

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Area of Science:

  • * Immunology
  • * Hematology
  • * Oncology

Background:

  • * Platelets (thrombocytes) traditionally recognized for hemostasis and thrombosis.
  • * Emerging research highlights significant nonhemostatic roles.
  • * Platelets are increasingly implicated in diverse pathological processes.

Purpose of the Study:

  • * To review the central mechanisms of platelet nonhemostatic functions.
  • * To summarize evidence of platelet involvement in inflammatory, immune, and malignant diseases.

Main Methods:

  • * Comprehensive literature review of experimental evidence.
  • * Analysis of studies defining platelet roles in nonhemostatic functions.
  • * Synthesis of data on platelet-mediated disease processes.

Main Results:

  • * Established platelet involvement in immune regulation and inflammatory responses.
  • * Evidence links platelets to the progression of various malignant diseases.
  • * Identified key molecular and cellular mechanisms driving these nonhemostatic functions.

Conclusions:

  • * Platelets are critical effectors in nonhemostatic processes.
  • * Understanding these roles offers new therapeutic targets for inflammatory, immune, and malignant conditions.