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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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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.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
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Related Experiment Video

Updated: Mar 24, 2026

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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Platelet Physiology.

Thomas Gremmel1, Andrew L Frelinger1, Alan D Michelson1

  • 1Division of Hematology/Oncology, Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts.

Seminars in Thrombosis and Hemostasis
|March 2, 2016
PubMed
Summary
This summary is machine-generated.

Platelets, small blood cells, are crucial for hemostasis and thrombosis. Emerging research highlights their roles in inflammation, immunity, and cancer, increasing the importance of understanding platelet structure and function.

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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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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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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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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Area of Science:

  • Hematology
  • Cell Biology
  • Pathophysiology

Background:

  • Platelets are the smallest blood cells, essential for hemostasis and thrombosis.
  • Their roles extend beyond clotting to inflammation, immunity, and cancer progression.
  • Understanding platelet physiology is vital for research and medicine.

Purpose of the Study:

  • To provide a comprehensive overview of platelet physiology.
  • To detail platelet structure, including granules and surface glycoproteins.
  • To explain platelet activation pathways.

Main Methods:

  • Literature review of platelet physiology.
  • Focus on structural components.
  • Analysis of activation mechanisms.

Main Results:

  • Platelets possess complex structures with diverse granules.
  • Specific surface glycoproteins mediate platelet interactions.
  • Distinct activation pathways regulate platelet responses.

Conclusions:

  • Platelet structure and function are multifaceted.
  • Platelets are key mediators in various pathophysiological processes.
  • In-depth knowledge of platelets is critical for advancing medical research.