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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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, and...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
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.
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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...

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Related Experiment Video

Updated: May 29, 2026

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

Developmental haemostasis: secondary haemostasis.

Paul Monagle1, Patricia Massicotte

  • 1Department of Clinical Haematology, Royal Children's Hospital, Melbourne, Australia. paul.monagle@rch.org.au

Seminars in Fetal & Neonatal Medicine
|August 30, 2011
PubMed
Summary

Developmental haemostasis explores age-related changes in blood clotting. This study focuses on secondary haemostasis, examining plasma protein shifts from fetal to adult stages, especially during infancy.

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The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
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Last Updated: May 29, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Published on: February 27, 2026

Area of Science:

  • Hematology
  • Physiology
  • Developmental Biology

Background:

  • The haemostatic system maintains blood clotting through complex interactions.
  • It comprises primary, secondary, and tertiary haemostasis.
  • Developmental haemostasis describes age-related changes in coagulation.

Purpose of the Study:

  • To examine developmental changes in secondary haemostasis.
  • Focus on plasma protein alterations from fetal to adult stages.
  • Highlight significant changes during the fetal and neonatal periods.

Main Methods:

  • Literature review focusing on secondary haemostasis.
  • Analysis of age-related plasma protein changes.
  • Comparison of fetal, neonatal, and adult haemostatic systems.

Main Results:

  • Secondary haemostasis undergoes significant development.
  • Plasma protein levels and function change markedly from fetal to adult life.
  • The fetal and neonatal periods show the most pronounced haemostatic variations.

Conclusions:

  • Understanding developmental haemostasis is crucial for pediatric care.
  • Age-specific reference ranges for coagulation factors are essential.
  • Further research into neonatal haemostasis can improve clinical outcomes.