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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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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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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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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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Related Experiment Video

Updated: Jul 23, 2025

An Experimental Study on Colorado Potato Beetle Hibernation Under Natural Conditions
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An Experimental Study on Colorado Potato Beetle Hibernation Under Natural Conditions

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Hibernation and hemostasis.

Edwin L De Vrij1,2, Hjalmar R Bouma2,3, Robert H Henning2

  • 1Department of Plastic Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.

Frontiers in Physiology
|July 12, 2023
PubMed
Summary
This summary is machine-generated.

Hibernating mammals possess unique blood clotting adaptations, suppressing clot formation during torpor and restoring it upon arousal. These mechanisms prevent injury during prolonged immobility and cold exposure.

Keywords:
coagulationhemostasishibernationhypothermiametabolismplatelettorpor

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Area of Science:

  • Physiology
  • Comparative Biology
  • Biochemistry

Background:

  • Hibernating mammals exhibit remarkable physiological adaptations to survive extreme conditions like low body temperature and immobility.
  • Maintaining hemostasis (blood clotting) is critical, requiring suppression of clotting during torpor and rapid restoration upon arousal to prevent thrombosis and hemorrhage, respectively.

Purpose of the Study:

  • To review the physiological and metabolic adaptations in blood clotting mechanisms of hibernating mammals.
  • To elucidate the underlying molecular and cellular strategies that prevent organ injury during hibernation.

Main Methods:

  • Comparative analysis of blood clotting factors and platelet function across multiple hibernating species.
  • Review of existing literature on physiological changes during hibernation (torpor) and arousal.

Main Results:

  • Hibernators show reversible decreases in circulating platelets and coagulation factors during torpor.
  • Hibernator platelets exhibit cold-resistance due to intrinsic adaptations, unlike those from non-hibernators.
  • Accelerated fibrinolysis (clot breakdown) during torpor further prevents excessive clotting.

Conclusions:

  • Hibernating mammals employ sophisticated, reversible adaptations in hemostasis to survive prolonged immobility and cold.
  • These adaptations involve changes in platelets, coagulation factors, and fibrinolysis.
  • Understanding these mechanisms may offer insights for medical applications in platelet preservation and antithrombotic therapies.