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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...
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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.
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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Updated: May 9, 2026

Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications
09:19

Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications

Published on: September 15, 2017

Bio-responsive polymer hydrogels homeostatically regulate blood coagulation.

Manfred F Maitz1, Uwe Freudenberg, Mikhail V Tsurkan

  • 1Max Bergmann Center of Biomaterials, Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany.

Nature Communications
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

A novel hydrogel system delivers heparin in response to blood clotting factors, providing sustained, autoregulated anticoagulation. This bio-responsive material offers a promising approach for advanced medical therapies and drug delivery systems.

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Engineering a Bilayered Hydrogel to Control ASC Differentiation
07:48

Engineering a Bilayered Hydrogel to Control ASC Differentiation

Published on: May 25, 2012

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Last Updated: May 9, 2026

Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications
09:19

Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications

Published on: September 15, 2017

Engineering a Bilayered Hydrogel to Control ASC Differentiation
07:48

Engineering a Bilayered Hydrogel to Control ASC Differentiation

Published on: May 25, 2012

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Medical therapies can be advanced by bio-responsive materials that mimic tissue adaptation.
  • Current anticoagulation methods face challenges in sustained and regulated delivery.

Purpose of the Study:

  • To develop a blood coagulation-responsive hydrogel for controlled heparin delivery.
  • To demonstrate the hydrogel's ability to provide autoregulated anticoagulation.

Main Methods:

  • Fabrication of a bio-responsive hydrogel system.
  • Testing the hydrogel's response to thrombin levels and blood coagulation.
  • Evaluating sustained anticoagulation efficacy in vitro.

Main Results:

  • The hydrogel released heparin in amounts triggered by thrombin.
  • The system quantitatively quenched blood coagulation over several hours.
  • The hydrogel demonstrated sustained anticoagulation during repeated blood incubations.

Conclusions:

  • The developed hydrogel offers sustainable, autoregulated anticoagulation.
  • This bio-responsive system addresses limitations in current medical therapies.
  • The concept paves the way for controlled drug and biomolecule delivery.