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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...
Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
Alterations in Blood Pressure01:30

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

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Related Experiment Video

Updated: Jun 9, 2026

Integrated Compensatory Responses in a Human Model of Hemorrhage
07:57

Integrated Compensatory Responses in a Human Model of Hemorrhage

Published on: November 20, 2016

[Hemostasis changes and their correction by adaptogen].

I I Shakhmatov, Iu A Bondarchuk, V M Vdovin

    Patologicheskaia Fiziologiia I Eksperimental'Naia Terapiia
    |September 1, 2010
    PubMed
    Summary

    Extreme exercise in rats causes hypercoagulation and thrombinemia. Eleutherococcus extract prevented blood clotting, suggesting a protective effect against exercise-induced hemostasis changes.

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    Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
    16:31

    Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock

    Published on: June 6, 2011

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    Last Updated: Jun 9, 2026

    Integrated Compensatory Responses in a Human Model of Hemorrhage
    07:57

    Integrated Compensatory Responses in a Human Model of Hemorrhage

    Published on: November 20, 2016

    Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
    16:31

    Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock

    Published on: June 6, 2011

    Area of Science:

    • Physiology
    • Hematology

    Context:

    • Investigates the hemostasis system's response to extreme physical exertion.
    • Examines physiological changes in rats subjected to prolonged swimming and running.

    Purpose:

    • To understand the hemostatic alterations induced by strenuous exercise.
    • To evaluate the potential prophylactic effects of Eleutherococcus extract on exercise-induced coagulopathy.

    Summary:

    • Extreme exercise (2-hour swimming, 8-hour running) in rats led to hypercoagulation and thrombinemia.
    • A decrease in anticoagulative and fibrinolytic activity heightened the risk of intravascular blood coagulation.
    • A 30-day Eleutherococcus extract regimen mitigated these exercise-induced hemostatic disruptions.

    Impact:

    • Highlights the significant hemostatic challenges posed by extreme exercise.
    • Demonstrates the potential of Eleutherococcus extract in preventing exercise-induced intravascular coagulation.
    • Provides insights into managing coagulopathy in physically demanding scenarios.