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Related Concept Videos

Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Structure and Function of Erythrocytes01:29

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There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
The erythrocyte plasma membrane is associated with proteins such as spectrin, which forms a flexible cytoplasmic meshwork. This meshwork allows erythrocytes to twist, turn, become cup-shaped, and regain their biconcave shape as they pass through narrow capillaries. Additionally, erythrocytes can form...
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Structure and Function of Platelets01:18

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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Formation of the Platelet Plug01:22

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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.
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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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Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
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Related Experiment Video

Updated: May 2, 2026

Controlled Microfluidic Environment for Dynamic Investigation of Red Blood Cell Aggregation
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A new red cell shape helps the clot.

Robert A S Ariëns1

  • 1UNIVERSITY OF LEEDS.

Blood
|March 15, 2014
PubMed
Summary

Red blood cells adopt a newly discovered shape that plays a crucial role in the process of blood clotting. This finding enhances our understanding of hemostasis and thrombosis mechanisms.

Area of Science:

  • Hematology
  • Cell Biology
  • Biophysics

Background:

  • Blood clotting, or coagulation, is a vital physiological process essential for hemostasis.
  • Disruptions in normal blood clotting can lead to serious medical conditions such as thrombosis and hemorrhage.
  • The morphology of cellular components, including red blood cells, is increasingly recognized for its impact on blood flow and clot formation.

Purpose of the Study:

  • To investigate the morphological characteristics of red blood cells during blood clotting.
  • To identify any previously undiscovered shapes adopted by red blood cells in the context of thrombosis.
  • To elucidate the functional role of these novel red blood cell shapes in the coagulation cascade.

Main Methods:

  • Utilized advanced microscopy techniques to visualize red blood cell morphology in real-time during clot formation.

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  • Employed rheological measurements to assess the impact of red blood cell shape on blood viscosity and clot dynamics.
  • Conducted biochemical assays to analyze the interaction of uniquely shaped red blood cells with clotting factors.

    • Main Results:

    • Discovered and characterized a novel, irregular shape adopted by red blood cells under pro-thrombotic conditions.
    • Observed that these uniquely shaped red blood cells exhibit increased adhesion to the forming clot matrix.
    • Demonstrated that the altered red blood cell morphology significantly enhances the rate and stability of blood clot formation.

    Conclusions:

    • Red blood cells can adopt specific, previously unrecognized shapes that actively contribute to blood clot formation.
    • This discovery provides new insights into the cellular mechanisms underlying thrombosis.
    • Targeting red blood cell shape may offer novel therapeutic strategies for managing thrombotic disorders.