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Related Concept Videos

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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate 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...
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...
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.
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...

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Updated: Jun 7, 2026

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
12:48

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus

Published on: October 13, 2008

Coagulation in invertebrates.

Lage Cerenius1, Kenneth Söderhäll

  • 1Department of Comparative Physiology, Uppsala University, Uppsala, Sweden.

Journal of Innate Immunity
|November 6, 2010
PubMed
Summary

Animal coagulation systems prevent fatal fluid loss and microbial invasion from injuries. This review explores recent findings in arthropods, highlighting the crucial role of these systems in invertebrate survival.

Area of Science:

  • Zoology
  • Comparative Physiology
  • Immunology

Background:

  • Animals require rapid mechanisms to halt bleeding from injuries to prevent fatal fluid loss.
  • Open circulatory systems in invertebrates are particularly vulnerable to hemorrhage and microbial dissemination.
  • Coagulation systems are essential for invertebrates to manage wound healing and prevent systemic infections.

Purpose of the Study:

  • To review recent advancements in understanding animal coagulation systems.
  • To focus on detailed data from arthropods regarding their coagulation processes.
  • To explore the prevalence and significance of coagulation systems across diverse animal phyla.

Main Methods:

  • Literature review of recent scientific developments.
  • Analysis of data primarily from arthropod models.

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Mechanical Vessel Injury in Zebrafish Embryos

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Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo

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Last Updated: Jun 7, 2026

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
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Published on: October 13, 2008

Mechanical Vessel Injury in Zebrafish Embryos
06:38

Mechanical Vessel Injury in Zebrafish Embryos

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Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo
06:23

Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo

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  • Comparative discussion of coagulation mechanisms.

    • Main Results:

    • Coagulation systems are vital for preventing blood loss and microbial spread in invertebrates with open circulatory systems.
    • Detailed data from arthropods reveal sophisticated coagulation pathways.
    • Evidence suggests widespread, yet understudied, coagulation systems across most animal phyla.

    Conclusions:

    • Invertebrate coagulation systems are critical for survival following injury.
    • Arthropods provide valuable models for studying these essential biological processes.
    • Further research is needed to fully elucidate the diversity and function of coagulation across the animal kingdom.