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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...
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...
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.
Extrinsic and Intrinsic Pathways of Hemostasis01:20

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
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 forms a...
Coagulation01:09

Coagulation

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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Related Experiment Video

Updated: May 12, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Platelet physiology.

Matthew D Linden1

  • 1Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Crawley, WA, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

Platelets are vital blood cell fragments crucial for blood clot formation, impacting thrombosis and hemostasis. Their diverse roles extend to immunity, inflammation, and wound healing, making them key research targets for diseases like atherothrombosis.

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Related Experiment Videos

Last Updated: May 12, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

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

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
08:04

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Area of Science:

  • Hematology
  • Immunology
  • Vascular Biology

Background:

  • Platelets are essential blood cell fragments involved in hemostasis and thrombosis.
  • They exhibit rapid structural and phenotypic changes in response to vascular injury.
  • Platelet activation is critical for forming blood clots and releasing mediators.

Purpose of the Study:

  • To summarize the multifaceted roles of platelets in health and disease.
  • To highlight the significance of platelets in atherothrombosis and inflammatory conditions.
  • To underscore the importance of antiplatelet therapy in disease management.

Main Methods:

  • Review of current scientific literature on platelet function.
  • Analysis of platelet roles in thrombosis, hemostasis, immunity, and inflammation.
  • Examination of the therapeutic implications of antiplatelet agents.

Main Results:

  • Platelets are central to hemostasis and thrombosis, forming clots upon vascular injury.
  • Beyond clotting, platelets significantly influence immune responses, inflammation, and wound healing.
  • Platelet involvement in atherothrombosis is a major focus of ongoing research.

Conclusions:

  • Platelets possess diverse functions extending beyond hemostasis, impacting multiple physiological and pathological processes.
  • Understanding platelet behavior is crucial for managing inflammatory and atherothrombotic diseases.
  • Antiplatelet therapies are indispensable for preventing and treating conditions associated with platelet hyperreactivity.