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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...
Production of Formed Elements01:34

Production of Formed Elements

Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...
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.

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Related Experiment Video

Updated: May 19, 2026

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

Platelets: production, morphology and ultrastructure.

Jonathan N Thon1, Joseph E Italiano

  • 1Department of Medicine, Brigham and Women's Hospital, 1 Blackfan Circle, Karp 6, Boston, MA, USA.

Handbook of Experimental Pharmacology
|August 25, 2012
PubMed
Summary
This summary is machine-generated.

Platelet production from megakaryocytes is complex, involving proplatelet extensions. Understanding these mechanisms is crucial for comprehending platelet functions in hemostasis, angiogenesis, and immunity.

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Related Experiment Videos

Last Updated: May 19, 2026

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Published on: July 10, 2017

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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In Situ Exploration of Murine Megakaryopoiesis using Transmission Electron Microscopy
08:15

In Situ Exploration of Murine Megakaryopoiesis using Transmission Electron Microscopy

Published on: September 8, 2021

Area of Science:

  • Hematology
  • Cell Biology
  • Biomedical Science

Background:

  • Platelets are essential anucleate cells regulating hemostasis, angiogenesis, and immunity.
  • Megakaryocytes, residing in bone marrow, are the precursor cells for platelet production.
  • The intricate process of platelet formation from megakaryocytes remains incompletely understood.

Purpose of the Study:

  • To elucidate the complex mechanisms governing platelet production from megakaryocytes.
  • To detail the structural development of platelets during their maturation process.
  • To highlight the importance of understanding platelet biogenesis for their diverse biological roles.

Main Methods:

  • The study reviews the morphological and ultrastructural aspects of megakaryocyte maturation and proplatelet formation.
  • Analysis of the structural elements developed by platelets during their release from megakaryocytes.
  • Integration of current knowledge on the biological functions of platelets.

Main Results:

  • Platelets originate from large megakaryocytes through proplatelet elongations into sinusoidal blood vessels.
  • During maturation, platelets acquire distinct structural components, including membranes, cytoskeletal networks, and organelles.
  • Key structural elements include the open canalicular system (OCS), dense tubular system (DTS), and various granules.

Conclusions:

  • Platelet biogenesis is an elaborate process critical for defining platelet morphology and function.
  • A comprehensive understanding of platelet production mechanisms is vital for appreciating their multifaceted roles in health and disease.
  • Further research into megakaryocyte biology and platelet formation is warranted.