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Related Concept Videos

Coagulation01:06

Coagulation

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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...
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Coagulation01:09

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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.
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Composition of Blood01:22

Composition of Blood

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The blood in our bodies comprises three major components: blood plasma, formed elements, and the extracellular matrix. Blood plasma is a yellowish fluid that constitutes 55% of the total blood volume. It is primarily made up of water and essential substances such as electrolytes and proteins. Blood plasma serves as a medium for transporting blood cells and also contains nutrients, enzymes, hormones, antibodies, and gases.
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Blood Flow01:29

Blood Flow

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Blood Types02:20

Blood Types

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Human blood is classified into different types based on the presence of antigens on the red blood cell's surface and antibodies in the plasma. Proper identification of blood type is essential for successful blood transfusion. The International Society of Blood Transfusion has identified 38 human blood types based on the surface antigens on the red blood cells. The most common types are ABO, Rh, and MNS blood types.
ABO blood group
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Blood Pressure01:24

Blood Pressure

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The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
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Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
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Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

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Blood coagulation dissected.

Edward L G Pryzdial1, Frank M H Lee2, Bryan H Lin2

  • 1Centre for Innovation, Canadian Blood Services, Ottawa, ON, Canada; Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada.

Transfusion and Apheresis Science : Official Journal of the World Apheresis Association : Official Journal of the European Society for Haemapheresis
|July 28, 2018
PubMed
Summary
This summary is machine-generated.

Hemostasis, the body's process to stop bleeding, involves platelets and fibrin clot formation. Maintaining hemostatic balance is crucial to prevent thrombosis or hemorrhage, impacting global health.

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Area of Science:

  • Physiology
  • Biochemistry
  • Hematology

Background:

  • Hemostasis is the critical physiological process controlling bleeding.
  • It involves intricate interactions between platelets and the subendothelial matrix.
  • Imbalances in hemostasis lead to significant global health burdens like thrombosis and hemorrhage.

Purpose of the Study:

  • To elucidate the multi-stage process of hemostasis.
  • To describe the roles of platelets and fibrin in forming a hemostatic plug.
  • To explain the regulatory mechanisms involving anticoagulant and antifibrinolytic pathways.

Main Methods:

  • Review of physiological and biochemical pathways of hemostasis.
  • Analysis of platelet activation, aggregation, and fibrin clot formation.
  • Examination of regulatory feedback loops in hemostasis.

Main Results:

  • Platelets initiate hemostasis through localization, stimulation, and aggregation.
  • Fibrin clot formation provides a secondary, stabilized seal.
  • Anticoagulant and antifibrinolytic pathways maintain physiological hemostatic balance.

Conclusions:

  • Hemostasis is a tightly regulated process essential for preventing excessive bleeding.
  • Dysregulation of hemostatic pathways results in pathological conditions.
  • Understanding these pathways is vital for managing bleeding disorders and thrombotic events.