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相关概念视频

Structure and Function of Platelets01:18

Structure and Function of Platelets

1.2K
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

Formation of the Platelet Plug

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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.
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...
6.4K
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.
6.1K
Introduction to Hemostasis01:05

Introduction to Hemostasis

8.0K
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,...
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

708
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...
708
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

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

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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.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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相关实验视频

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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血小板:生理学和生物化学

Kerstin Jurk1, Beate E Kehrel1

  • 1Department of Anaesthesiology and Intensive Care, Experimental and Clinical Haemostasis, University-Hospital Munster, Munster, Germany.

Seminars in thrombosis and hemostasis
|December 12, 2023
PubMed
概括
此摘要是机器生成的。

血小板是血液中重要的细胞,参与血液静止,炎症和伤口愈合. 本综述详细介绍了血小板激活过程及其与其他细胞的相互作用,这对于理解这些功能至关重要.

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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科学领域:

  • 血液学 血液学 血液学
  • 细胞生物学 细胞生物学
  • 生理学 生理学 生理学

背景情况:

  • 血小板是专门的血液细胞,是生理和病理过程中不可或缺的组成部分.
  • 血小板激活是一个复杂的过程,涉及粘附和信号分子,对于它们的各种功能至关重要.

研究的目的:

  • 为了提供对初级和二级血静中血小板激活过程的概述.
  • 为了突出激活血小板和其他血液和血管细胞之间的交叉对话.
  • 讨论受体介导的血栓生成和调节血小板功能的信号通路.

主要方法:

  • 对有关血小板激活的现有文献的综述.
  • 讨论血小板的关键功能,包括粘附,分泌,聚合和微囊的形成.
  • 重点是细胞相互作用和信号通路.

主要成果:

  • 活化血小板在血液静止,炎症,瘤转移,伤口愈合和宿主防御中发挥着核心作用.
  • 血小板激活涉及粘附,分泌,聚合,微囊形成和凝块稳定.
  • 活化血小板与白细胞和内皮细胞相互作用,影响炎症反应和血管损伤修复.

结论:

  • 血小板激活是一个多方面的过程,对血液静止和其他生理功能至关重要.
  • 了解血小板信号通路是调节它们在各种疾病中的功能的关键.
  • 血小板在血液和血管细胞之间的复杂通信网络中扮演着关键的媒介.