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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...
Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...
Cell Size01:22

Cell Size

Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding the cells limits the...
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.
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...

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Updated: May 21, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

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

Published on: December 27, 2017

Does size matter in platelet production?

Jonathan N Thon1, Joseph E Italiano

  • 1Hematology Division, Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA.

Blood
|June 6, 2012
PubMed
Summary
This summary is machine-generated.

Platelet production involves intermediate stages like proPLTs. Understanding these stages and cytoskeletal regulation may improve therapies for macrothrombocytopenias, conditions characterized by large platelets.

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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Last Updated: May 21, 2026

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

Published on: December 27, 2017

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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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
  • Cell Biology
  • Developmental Biology

Background:

  • Platelet (PLT) production is the final stage of megakaryocyte (MK) development.
  • MKs in bone marrow release proPLTs that mature into circulating platelets via abscission.
  • Intermediate structures, circular-prePLTs, can convert into barbell-proPLTs, potentially linked to macrothrombocytopenias.

Purpose of the Study:

  • To review and contextualize current knowledge of terminal platelet production.
  • To compare "large platelets" in macrothrombocytopenias with intermediate platelet precursors.
  • To elucidate the role of cytoskeletal mechanisms in platelet formation and size regulation.

Main Methods:

  • Literature review and synthesis of existing research on platelet production and macrothrombocytopenias.
  • Analysis of cytoskeletal regulation in platelet precursor morphology and division.
  • Comparison of platelet characteristics in inherited and acquired macrothrombocytopenias.

Main Results:

  • Platelet size and number are inversely proportional.
  • Platelet precursors (barbell-proPLTs) can enlarge and divide in culture, yielding smaller platelets.
  • Macrothrombocytopenias may arise from failures in these intermediate platelet production stages.

Conclusions:

  • "Large platelets" in macrothrombocytopenias share similarities with intermediate platelet precursors.
  • Understanding cytoskeletal regulation of platelet formation offers therapeutic potential.
  • Further research can improve treatments for platelet production disorders and platelet availability for transfusion.