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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...
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
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...
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.
Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...

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Related Experiment Video

Updated: Jun 11, 2026

In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time
09:19

In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time

Published on: May 24, 2020

Vascular haemostasis.

N S Key1, A DE Paepe, F Malfait

  • 1Harold R Roberts Comprehensive Hemophilia Diagnostic and Treatment Center, University of North Carolina, Chapel Hill, NC, USA. nigel_key@med.unc.edu

Haemophilia : the Official Journal of the World Federation of Hemophilia
|July 2, 2010
PubMed
Summary
This summary is machine-generated.

This session explores inherited vascular disorders, including hemophilia A and B, Ehlers-Danlos syndromes, and hereditary hemorrhagic telangiectasia. Advances in diagnosis and management for these bleeding disorders are discussed.

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Last Updated: Jun 11, 2026

In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time
09:19

In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time

Published on: May 24, 2020

Simple and Effective Procedure for Hemostasis in Mouse Arteries
05:34

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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Area of Science:

  • Vascular biology
  • Hematology
  • Genetics

Background:

  • Focuses on inherited vascular abnormalities presenting as hemorrhagic disorders.
  • Discusses the interplay between the vessel wall and coagulation system, including hemophilia A and B.
  • Addresses heritable collagen disorders like Ehlers-Danlos syndromes (EDS) and hereditary hemorrhagic telangiectasia (HHT).

Purpose of the Study:

  • To review selected inherited vascular abnormalities and their manifestation as hemorrhagic disorders.
  • To discuss the cellular origin of tissue factor (TF) and thrombin generation in hemostasis.
  • To present recent developments in the diagnosis and management of EDS and HHT.

Main Methods:

  • Review of current literature and research on inherited vascular disorders.
  • Discussion of biochemical and molecular testing for EDS subtypes.
  • Analysis of published management guidelines for HHT.

Main Results:

  • Hemophilia A and B involve the coagulation system and vessel wall interactions.
  • EDS are heterogeneous collagen disorders with available genetic testing.
  • HHT is characterized by arteriovenous malformations linked to TGF-beta signaling pathway mutations.

Conclusions:

  • Accurate testing for EDS aids genetic counseling and medical management.
  • Several HHT management guidelines offer improved patient care.
  • Understanding these vascular disorders is crucial for effective treatment and counseling.