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Formation of the Platelet Plug

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...

Structure and Function of Platelets

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...

Clot Retraction and Fibrinolysis

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.

Extrinsic and Intrinsic Pathways of Hemostasis

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...

Coagulation

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...

Introduction to Hemostasis

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.
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Related Experiment Video

Updated: Jul 10, 2026

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Published on: November 22, 2024

Platelet-activating factor.

John S Owen¹, Michael J Thomas, Robert L Wykle

¹Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.

Methods in Enzymology

|October 24, 2007

Summary

Quantifying platelet-activating factor (PAF) is challenging. This study presents a sensitive high-pressure liquid chromatography-tandem mass spectrometry method for accurate PAF measurement in various samples.

Area of Science:

Biochemistry
Analytical Chemistry
Pharmacology

Background:

Platelet-activating factor (PAF) is a potent mediator found at low concentrations.
Accurate PAF quantitation is difficult due to its properties and similarity to other phospholipids.
Existing PAF assays have limitations.

Purpose of the Study:

To describe a high-pressure liquid chromatography (HPLC)-tandem mass spectrometry assay for PAF.
To highlight the assay's sensitivity and selectivity.
To provide technical guidance for applying the method to diverse sample types.

Main Methods:

High-pressure liquid chromatography (HPLC) coupled with tandem mass spectrometry.
Utilized liquid chromatography to avoid sample derivatization.

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Last Updated: Jul 10, 2026

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Published on: November 22, 2024

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Performed two HPLC runs per sample for comprehensive analysis.

Main Results:

Achieved high sensitivity with a detection limit of 1 pg.
Demonstrated excellent selectivity for PAF.
Successfully applied the method to various sample types.

Conclusions:

The described HPLC-tandem mass spectrometry assay offers a sensitive and selective method for PAF quantitation.
Avoiding derivatization through liquid chromatography simplifies the process.
The method's limitations include expensive instrumentation and the need for dual HPLC runs.