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Related Concept Videos

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.
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...
Overview of the Cardiovascular System01:14

Overview of the Cardiovascular System

The cardiovascular system is a vital transportation system in the body. It comprises the heart and blood vessels and facilitates the exchange of gases, nutrients, and waste products.
Heart
The heart is the central pump of the cardiovascular system that circulates blood throughout the body. It comprises two atria receiving the blood and two ventricles pumping blood out of the heart. Their rhythmic contractions, called heartbeats, ensure that blood flow remains continuous.
Blood Vessels
Blood...
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...
Anatomy of Blood Vessels01:20

Anatomy of Blood Vessels

The vascular system, an integral part of the circulatory system, comprises various blood vessels that play crucial roles in maintaining the body's homeostasis. These blood vessels form a complex and efficient circulatory network. The three primary categories of blood vessels are the arteries, veins, and capillaries.
Arteries
Arteries circulate oxygenated blood from the heart, except the pulmonary artery, which transports deoxygenated blood to the lungs. Large arteries, such as the aorta, have...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...

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Updated: Jun 21, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Hemorheology and circulation.

A Marossy1, P Svorc, I Kron

  • 1Department of Physiology, Medical Faculty, P.J. Safárik University, Kosice, Slovak Republic. marossy@pobox.sk

Clinical Hemorheology and Microcirculation
|July 25, 2009
PubMed
Summary
This summary is machine-generated.

Blood circulation relies on its rheological properties and vessel characteristics. Understanding blood flow resistance requires considering both macroscopic and microscopic levels of hemorheology.

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Integrated Compensatory Responses in a Human Model of Hemorrhage

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Last Updated: Jun 21, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Published on: April 25, 2013

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

Area of Science:

  • Physiology
  • Biophysics

Background:

  • Blood circulation is vital for transporting oxygen, nutrients, waste products, heat, and immune signals.
  • Circulation is driven by the heart and influenced by blood's rheological properties and vascular network characteristics.

Purpose of the Study:

  • To analyze the factors influencing blood flow resistance.
  • To differentiate influences based on the level of investigation (macroscopic vs. microscopic).

Main Methods:

  • Analysis of hemorheological properties.
  • Consideration of vascular architecture and blood component behavior (cells and plasma).
  • Examination of blood flow at both macroscopic and microscopic vessel levels.

Main Results:

  • Blood flow resistance is determined by vascular network complexity and the flow behavior of blood components.
  • Blood exhibits liquid properties at a macroscopic level but contains solid cellular components at a microscopic level.
  • Distinct considerations for blood flow in large vessels versus microvessels are necessary.

Conclusions:

  • Blood's rheological properties are critical for effective circulation.
  • A multi-level approach (macroscopic and microscopic) is essential for comprehending hemorheology and blood flow.
  • Understanding these factors is key to understanding overall circulatory function.