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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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Disorders of Hemostasis01:24

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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.
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Disorders of Leukocytes01:27

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Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
Leukopenia may result from bone marrow disorders, autoimmune diseases, and infectious diseases. For example, conditions such as multiple myeloma and aplastic anemia can impair the bone marrow's ability to produce adequate leukocytes. Similarly, autoimmune diseases like lupus and viral infections such as HIV can prompt the immune...
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Structure and Function of Leukocytes01:21

Structure and Function of Leukocytes

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An adult in good health typically has between 4,500 and 11,000 leukocytes, or white blood cells, per microliter of blood, which constitutes about 1% of the total blood volume. Unlike red blood cells, white blood cells contain a nucleus and other cellular organelles but do not have hemoglobin. Most white blood cells reside in connective tissues, particularly in lymphatic organs such as the lymph nodes, with only a small fraction present in circulating blood.
White blood cells protect the body...
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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Related Experiment Video

Updated: Mar 11, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Platelets in infectious disease.

Elizabeth Middleton1,2, Matthew T Rondina1,2,3

  • 1Program in Molecular Medicine and.

Hematology. American Society of Hematology. Education Program
|December 4, 2016
PubMed
Summary
This summary is machine-generated.

Sepsis involves complex inflammatory responses, and understanding the role of platelets is crucial for improving patient outcomes. This review explores platelet function in sepsis pathophysiology.

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Treatment of Platelet Products with Riboflavin and UV Light: Effectiveness Against High Titer Bacterial Contamination
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Area of Science:

  • * Hematology
  • * Immunology
  • * Critical Care Medicine

Background:

  • * Sepsis is a life-threatening condition characterized by a dysregulated thrombo-inflammatory response to infection.
  • * Despite significant mortality, advances in sepsis treatment remain limited due to its heterogeneous nature.
  • * A deeper understanding of the cellular mechanisms underlying sepsis is essential.

Purpose of the Study:

  • * To review the complex pathophysiology of acute, systemic infections.
  • * To discuss the established and emerging roles of platelets in sepsis.
  • * To elucidate the molecular and functional changes in platelets during sepsis.

Main Methods:

  • * Literature review of existing research on sepsis and platelet biology.
  • * Analysis of current evidence on platelet involvement in infectious syndromes.
  • * Synthesis of findings to highlight platelet functions in sepsis.

Main Results:

  • * Platelets are key players in hemostasis, inflammation, and immune responses.
  • * Emerging evidence positions platelets as critical sentinel and effector cells in infectious diseases.
  • * The precise molecular and functional alterations in platelets during sepsis are not fully understood.

Conclusions:

  • * Platelets exhibit multifaceted roles in the dynamic pathophysiology of sepsis.
  • * Further research into platelet behavior during sepsis is needed to improve clinical management.
  • * Understanding platelet dysregulation is vital for addressing sepsis morbidity and mortality.