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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Structure and Function of Platelets01:18

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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.
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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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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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Coagulation01:09

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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

Updated: Apr 11, 2026

Microfluidics in Assessing Platelet Function
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Microfluidics in Assessing Platelet Function

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Platelet dysfunction in injured patients.

Noelle N Saillant1, Carrie A Sims1

  • 1Division of Traumatology, Department of Surgery Critical Care and Acute Care Surgery, University of Pennsylvania, University of Pennsylvania, 3400 Spruce Street, 5 Maloney, Philadelphia, Pennsylvania USA.

Molecular and Cellular Therapies
|June 10, 2015
PubMed
Summary
This summary is machine-generated.

Trauma-induced coagulopathy involves platelets, key players in hemostasis. Understanding platelet dysfunction in trauma is vital for improving patient outcomes and developing new treatments.

Keywords:
CoagulopathyCoated plateletsHemostasisPlatelet activationPlatelet functionPlatelet mitochondrial dysfunctionPlatelet storage lesionResuscitationTrauma

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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Area of Science:

  • Hematology
  • Trauma Medicine
  • Hemostasis

Background:

  • Trauma-induced coagulopathy (TIC) is a significant complication in critically injured patients.
  • Platelets are increasingly recognized as critical mediators and potential therapeutic targets in hemostasis.
  • Current understanding of platelet's role in trauma-related coagulopathy remains limited, despite their association with worse outcomes.

Purpose of the Study:

  • To review recent advancements in understanding hemostasis, focusing on the role of platelets.
  • To elucidate the mechanisms by which platelet dysfunction contributes to coagulopathy in trauma.
  • To highlight platelets as a potential therapeutic target for managing exsanguination in critically injured patients.

Main Methods:

  • Literature review of recent studies on hemostasis and trauma-induced coagulopathy.
  • Analysis of the cell-based model of hemostasis, emphasizing platelet and endothelial roles.
  • Synthesis of current knowledge on platelet function and dysfunction in trauma settings.

Main Results:

  • Platelets are central regulators of clot formation, acting as key mediators in hemostasis.
  • Platelet dysfunction is linked to adverse outcomes in trauma patients.
  • The precise mechanisms linking platelet dysfunction to coagulopathy require further investigation.

Conclusions:

  • A deeper understanding of platelet function in trauma is essential for effective hemostatic management.
  • Targeting platelet dysfunction presents a promising therapeutic strategy for trauma-induced coagulopathy.
  • Further research is needed to fully unravel the complex role of platelets in trauma and bleeding.