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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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

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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...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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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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Coagulation01:09

Coagulation

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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...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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: Dec 13, 2025

Author Spotlight: Improving the Production of Self-Assembling Fibers and Peptide Hydrogels for Superior Biocompatibility
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Self-Assembling Peptide Solution Accelerates Hemostasis.

Tiffany Carter1,2, Guangyan Qi1, Weiqun Wang3

  • 1Bio-Materials and Technology Lab, Grain Science and Industry, Kansas State University, Manhattan, Kansas, USA.

Advances in Wound Care
|July 28, 2020
PubMed
Summary

The novel h9e peptide demonstrates potent hemostatic capabilities, rapidly forming nanoweb structures to significantly accelerate blood clotting. This synthetic agent outperforms commercial products and shows excellent biocompatibility in preclinical models.

Keywords:
animal modelcoagulationhemostasishydrogelpeptidewound healing

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Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Area of Science:

  • Biomaterials Science
  • Hemostasis Research
  • Synthetic Peptide Therapeutics

Background:

  • Exsanguination is a leading cause of death in trauma patients.
  • Biological hemostatic agents carry infection risks.
  • Synthetic peptide-based agents offer a safer alternative.

Purpose of the Study:

  • To evaluate the hemostatic potential of the h9e peptide.
  • To compare h9e peptide efficacy against a commercial hemostatic agent (Celox™).
  • To assess the biocompatibility of h9e peptide.

Main Methods:

  • In vitro blood coagulation kinetics measured by dynamic rheometry.
  • In vivo hemostatic efficacy assessed in a Wistar rat model.
  • Platelet adhesion and subcutaneous injection studies in a mouse model for biocompatibility.

Main Results:

  • h9e peptide rapidly induced blood gelation, reaching >100 Pa within 3 seconds.
  • Coagulation strength increased with h9e peptide concentration.
  • In rats, 5% h9e peptide significantly reduced bleeding time and blood loss, outperforming Celox™.
  • Preliminary studies showed h9e peptide to be biocompatible in mice.

Conclusions:

  • h9e peptide exhibits highly efficient hemostatic effects by forming nanoweb-like structures.
  • It arrested bleeding 82% faster than Celox™.
  • h9e peptide is a promising hemostatic biomaterial with superior efficacy and biocompatibility.