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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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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.
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...
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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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Introduction to Hemostasis01:05

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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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Clot Retraction and Fibrinolysis01:16

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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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Coagulation01:09

Coagulation

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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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Related Experiment Video

Updated: Apr 5, 2026

Microfluidics in Assessing Platelet Function
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Neonatal Platelet Function.

Antonio Del Vecchio1, Mario Motta2, Costantino Romagnoli3

  • 1Neonatal Intensive Care Unit, Di Venere Hospital, Via Ospedale Di Venere n.1, Bari 70131, Italy.

Clinics in Perinatology
|August 8, 2015
PubMed
Summary
This summary is machine-generated.

Neonatal platelet hyporeactivity, or reduced platelet function, is normal in the first few days of life. Persistent hyporeactivity after ten days may indicate a platelet disorder in newborns.

Keywords:
MegakaryocytesNeonatal hemostasisPlatelet hyporeactivityPlateletsPrimary hemostasisThrombocytopoiesis

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Area of Science:

  • Neonatal physiology
  • Hematology
  • Developmental biology

Background:

  • Platelet production and function undergo age-dependent changes in neonates, similar to the developing plasma coagulation system.
  • Neonates exhibit generalized platelet hyporeactivity in the initial days of life.

Purpose of the Study:

  • To characterize the developmental trajectory of platelet function in newborns.
  • To establish a timeline for the resolution of neonatal platelet hyporeactivity.

Main Methods:

  • Platelet function testing was performed on cord blood and peripheral blood samples from neonates.
  • Analysis focused on the period from birth through the first ten days of life.

Main Results:

  • A generalized platelet hyporeactivity was observed in cord blood and peripheral blood during the first days of life.
  • Normal adult levels of platelet reactivity were achieved between the fifth and ninth day of life.

Conclusions:

  • Neonatal platelet hyporeactivity is a transient physiological phenomenon.
  • Persistent hyporeactivity beyond ten days of life warrants further investigation for potential platelet disorders.