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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
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...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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.
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 Blood Vessels01:14

Overview of Blood Vessels

The human cardiovascular system comprises five primary types of blood vessels: arteries, arterioles, veins, venules, and capillaries, each serving unique functions.
Arteries and Arterioles: Arteries are muscular and elastic vessels that primarily carry oxygenated blood from the heart to body tissues, except for the pulmonary artery, which carries deoxygenated blood. They have thick walls to withstand high pressure and contain a layer of muscle tissue, allowing them to expand or contract as...
Coagulation01:09

Coagulation

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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Related Experiment Video

Updated: Jul 14, 2026

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
08:30

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

Von Willebrand factor: looking back and looking forward.

Zaverio M Ruggeri1

  • 1The Scripps Research Institute, MEM-175, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA. ruggeri@scripps.edu

Thrombosis and Haemostasis
|June 29, 2007
PubMed
Summary

This review highlights how studying von Willebrand factor (VWF) and its role in haemostasis, through patient observation and basic research, has advanced our understanding of bleeding disorders and arterial thrombosis.

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Last Updated: Jul 14, 2026

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
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Area of Science:

  • Hematology
  • Molecular Biology
  • Vascular Biology

Background:

  • Decades of research on von Willebrand factor (VWF) have significantly advanced understanding of haemostasis.
  • Clinical observations of congenital disorders like haemophilia and von Willebrand disease have been crucial.
  • Basic research, including animal models and mutagenesis, provides insights into VWF function.

Observation:

  • VWF and its receptor, glycoprotein Ib, play a key role in the response to vascular injury.
  • Detailed knowledge exists, but integration into complex vascular responses requires further study.
  • Congenital haemostasis disorders offer valuable insights into VWF's physiological and pathological roles.

Findings:

  • Combining clinical insights with basic research is essential for understanding VWF.
  • VWF's role in platelet aggregation and vascular repair is complex.
  • Current knowledge provides a foundation for future research directions.

Implications:

  • Further research is needed to fully elucidate VWF's integration into vascular injury responses.
  • Translating current knowledge into novel treatments for arterial thrombosis is a key goal.
  • Understanding VWF's complex functions holds promise for developing new therapeutic strategies.