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Coagulation

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...

Coagulation

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 Hemostasis

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 Hemostasis

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...

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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: May 27, 2026

Mechanical Vessel Injury in Zebrafish Embryos

Mechanical Vessel Injury in Zebrafish Embryos

Published on: February 17, 2015

Blood coagulation in fish.

Russell F Doolittle, Douglas M Surgenor

The American Journal of Physiology

|November 23, 2011

Summary

This summary is machine-generated.

Fish blood coagulation involves fibrinogen and prothrombin, with thrombocytes crucial for intrinsic clotting. Calcium levels significantly impact clotting, fibrinolysis, and serum inhibition in fish.

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Published on: May 26, 2012

Area of Science:

Comparative hematology
Evolutionary biology
Biochemistry

Background:

The blood coagulation systems of various fish groups, including cyclostomes, elasmobranchs, and teleosts, exhibit conserved components.
Key clotting factors like fibrinogen and prothrombin are present across these diverse fish species.

Purpose of the Study:

To compare the blood coagulation mechanisms across cyclostome, elasmobranch, and teleost fish.
To investigate the role of thrombocytes and the influence of calcium on fish coagulation.

Main Methods:

Analysis of plasma fibrinogen and prothrombin activity.
Investigation of prothrombin conversion factors using intrinsic and extrinsic clotting schemes.
In vitro studies on smooth dogfish plasma with varying calcium concentrations.

Main Results:

All studied fish possessed functional fibrinogen and prothrombin, adsorbable by barium sulfate.
Fish thrombocytes are vital for intrinsic prothrombin conversion and clot retraction.
Smooth dogfish plasma exhibited a calcium-dependent clotting diathesis, leading to exaggerated thrombin generation, intense fibrinolysis, and serum inhibition by fibrinolysis breakdown products.

Conclusions:

Fish blood coagulation shares fundamental similarities with higher vertebrates but possesses unique features.
Thrombocytes play a significant role in initiating and regulating coagulation in fish.
Calcium ions are critical regulators of the coagulation cascade, influencing thrombin generation, fibrinolysis, and serum inhibition in fish.