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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
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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.
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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.
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Related Experiment Video

Updated: Jun 7, 2026

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
10:10

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Published on: October 27, 2009

Kinetics of Free Platelet Decrease After ADP: Effect of Fibrinogen Binding Inhibitors.

B Rocca1, R D Cristofaro, M D Ventura

  • 1Research Center on Hemostasis Pathophysiology, Department of Internal Medicine, Catholic University School of Medicine, Largo A, Gemelli 8, 00168, Rome, Italy.

Platelets
|November 4, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to measure platelet aggregation by tracking free platelets after adenosine-5-diphosphate (ADP) addition. This kinetic analysis offers a more accurate way to monitor anti-platelet drugs compared to traditional turbidometry.

More Related Videos

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Related Experiment Videos

Last Updated: Jun 7, 2026

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
10:10

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Published on: October 27, 2009

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Area of Science:

  • Hematology
  • Pharmacology
  • Biophysics

Background:

  • Platelet aggregation is crucial for hemostasis and thrombosis.
  • Traditional turbidometric methods for evaluating platelet aggregation have limitations in detecting early aggregation events.
  • A more sensitive method is needed to assess platelet function and the efficacy of anti-aggregating agents.

Purpose of the Study:

  • To analyze the kinetics of free-platelet decrease after adenosine-5-diphosphate (ADP) addition.
  • To compare this kinetic method with turbidometry for evaluating platelet aggregation.
  • To assess the utility of this method in monitoring anti-platelet drug effects.

Main Methods:

  • Analysis of free-platelet count decrease kinetics using a single exponential decay equation after ADP stimulation.
  • Comparison of the kinetic method with turbidometry in normal donors and thrombocytopenic subjects.
  • Evaluation of anti-aggregating effects of MK-852 using both methods.

Main Results:

  • The kinetic method quantifies maximal velocity, rate constant, and unreactive platelets.
  • Aggregation velocity correlates positively with platelet count and is enhanced by red blood cells.
  • Fibrinogen receptor blockade with MK-852 showed a more accurate dose-response curve and higher IC50 value compared to turbidometry.

Conclusions:

  • Kinetics of free-platelet decay accurately characterizes early platelet responses to ADP.
  • This method offers significant improvement over turbidometry for monitoring fibrinogen binding inhibitors.
  • The technique provides quantitative parameters for platelet aggregation analysis.