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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...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of 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.
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Related Experiment Video

Updated: Jul 1, 2026

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Platelet function in cutaneous diseases.

Alicja Kasperska-Zajac1, Zenon Brzoza, Barbara Rogala

  • 1Department of Internal Diseases, Allergology and Clinical Immunology, Medical University of Silesia [corrected] Poland. kasperska@plusnet.pl

Platelets
|September 16, 2008
PubMed
Summary

Blood platelets are key players in skin inflammation, releasing mediators and affecting immune cells. Their altered function in skin diseases like psoriasis contributes to disease development and may signal cardiovascular risks.

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Microfluidics in Assessing Platelet Function
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09:46

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

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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

Area of Science:

  • Dermatology
  • Immunology
  • Hematology

Background:

  • Blood platelets are increasingly recognized for their active role in immune-inflammatory responses.
  • Platelet activation releases various mediators and influences immune cell interactions, impacting inflammatory processes.
  • Skin immune-inflammatory conditions can trigger platelet activation, potentially modulating disease progression.

Purpose of the Study:

  • To outline current knowledge on platelet function in dermal disorders.
  • To highlight the role of platelets in the pathogenesis of inflammatory skin diseases.
  • To discuss the clinical significance of altered platelet activity in cutaneous conditions.

Main Methods:

  • Review of existing literature on platelet function in skin diseases.
  • Analysis of platelet-derived mediators and their impact on immune cells.
  • Examination of changes in platelet activity and reactivity in specific dermatoses.

Main Results:

  • Platelet activation releases mediators like RANTES, PF4, and TARC/CCL17, and affects molecules such as CD154 and P-selectin.
  • Activated platelets facilitate leukocyte rolling and mediator release in the skin.
  • Distinct alterations in platelet activity are observed in urticaria, atopic eczema/dermatitis syndrome, and psoriasis.

Conclusions:

  • Platelets are significant effector cells within the skin immune system, contributing to inflammatory skin disorders.
  • Altered platelet function is implicated in the pathogenesis of various cutaneous diseases.
  • Changes in platelet activity in skin inflammation may have clinical implications, including cardiovascular risk.