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相关概念视频

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

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...
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Structure and Function of Leukocytes01:21

Structure and Function of Leukocytes

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An adult in good health typically has between 4,500 and 11,000 leukocytes, or white blood cells, per microliter of blood, which constitutes about 1% of the total blood volume. Unlike red blood cells, white blood cells contain a nucleus and other cellular organelles but do not have hemoglobin. Most white blood cells reside in connective tissues, particularly in lymphatic organs such as the lymph nodes, with only a small fraction present in circulating blood.
White blood cells protect the body...
1.9K
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

4.2K
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.
4.2K
Coagulation01:09

Coagulation

4.9K
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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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相关实验视频

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An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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血小板向免疫学家的请求:请不要忘记我.

Vijay Kumar1, John H Stewart Iv1

  • 1Department of Surgery, Laboratory of Tumor Immunology and Immunotherapy, Medical Education Building-C, Morehouse School of Medicine, 720 Westview Drive, Atlanta, GA 30310 USA.

International immunopharmacology
|November 15, 2024
PubMed
概括

血小板对于血液凝固至关重要,也起着先天性免疫细胞的作用. 它们识别病原体和细胞损伤,与其他免疫细胞相互作用,维持整体免疫平衡.

科学领域:

  • 免疫学 免疫学 免疫学
  • 血液学 血液学 血液学
  • 细胞生物学 细胞生物学

背景情况:

  • 血小板是众所周知的血液静止和血液凝固.
  • 凝血和天生的免疫有着共同的进化联系.
  • 新兴研究强调了血小板的免疫功能.

研究的目的:

  • 讨论血小板的发育 (大核形成和血栓形成).
  • 探索血小板作为先天免疫细胞的关键作用.
  • 详细介绍血小板与免疫细胞的相互作用,以实现平衡.

主要方法:

  • 审查免疫学和血小板生物学方面的进展.
  • 讨论血小板功能:细胞化,媒介释放,免疫细胞调节.
  • 对血小板上的模式识别受体 (PRR) 的分析.

主要成果:

  • 血小板表达的PRR识别了病原体相关的分子模式 (PAMP/MAMP) 和损伤相关的分子模式 (DAMP).
  • 血小板与先天性和适应性免疫细胞直接相互作用.
  • 血小板对免疫系统的平衡有很大的贡献.

结论:

关键词:
豁免权是一种豁免权.巨细胞是一个巨细胞.巨核细胞 (Megacaryocytes) 是一个巨核细胞.中性粒细胞中性粒细胞.对于PRRs来说,这是一个很好的选择.血小板是血小板的组成部分.

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  • 血小板是天生的免疫系统的组成部分.
  • 它们的免疫功能对于维持宿主防御和恒温至关重要.
  • 需要对血小板免疫学进行进一步的研究.