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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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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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Overview of Hematopoiesis01:20

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
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Clot Retraction and Fibrinolysis01:16

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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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Related Experiment Video

Updated: Aug 4, 2025

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

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Platelet function in neonates and children.

Suelyn Van Den Helm1, Conor McCafferty1, Natasha Letunica2

  • 1Haematology Research, Murdoch Children's Research Institute, Melbourne, Australia; Department of Paediatrics, The University of Melbourne, Melbourne, Australia.

Thrombosis Research
|March 30, 2023
PubMed
Summary
This summary is machine-generated.

Platelet function in children is understudied. New methods allow better analysis of platelet roles in neonatal haemostasis and disease.

Keywords:
Blood plateletsChildNewbornPlatelet activationPlatelet aggregationPlatelet function tests

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

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Last Updated: Aug 4, 2025

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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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Area of Science:

  • Hematology
  • Pediatric Medicine
  • Hemostasis and Thrombosis

Background:

  • Platelets are crucial for hemostasis and coagulation, primarily forming stable clots to prevent bleeding.
  • Platelet studies in neonates and children are limited by large blood volume requirements for traditional tests like aggregometry.
  • Developmental changes in platelet function are less understood compared to plasma coagulation factors.

Conclusions:

  • Advances in testing methods are facilitating a better understanding of platelet roles in pediatric hemostasis.
  • Further research is needed to fully elucidate platelet function in neonates and children, particularly in disease states.
  • This review consolidates current knowledge and highlights future research directions in pediatric platelet research.