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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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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.
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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Inflammation01:38

Inflammation

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相关实验视频

Updated: Jun 6, 2025

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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老化期间的血小板生命周期:功能,生产和清除.

Friedrich Reusswig1, Olga An1, Carsten Deppermann1,2

  • 1Center for Thrombosis and Hemostasis, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany.

Platelets
|December 2, 2024
PubMed
概括

衰老显著改变了血小板的产生,功能和免疫细胞的相互作用,影响血液静止,增加了老年人血栓形成的风险. 需要进一步的研究来了解这些与年龄相关的血小板变化.

关键词:
衰老的衰老 衰老的衰老炎症 - 衰老 - 炎症 - 衰老巨细胞是什么?巨细胞是什么?巨核细胞是巨核细胞.血小板 血小板 是

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Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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相关实验视频

Last Updated: Jun 6, 2025

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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科学领域:

  • 血液学 血液学 血液学
  • 免疫学 免疫学 免疫学
  • 老年学是一门学科.

背景情况:

  • 血小板对于血液静止至关重要,它们的功能障碍会导致血栓形成,心肌梗塞和中风.
  • 衰老影响细胞,器官和系统过程,影响血小板计数,功能,受体表达和免疫细胞相互作用.

研究的目的:

  • 审查血小板生命周期中与年龄相关的变化.
  • 探索这些变化如何影响老年人的血静和血栓形成.
  • 确定未来关于衰老和血小板的研究领域.

主要方法:

  • 文献综述专注于与年龄相关的血小板生物学变化.
  • 分析血小板生产部位 (骨髓) 和清除器官 (肝脏,) 的变化.
  • 检查免疫系统改变在与年龄相关的血小板功能障碍中的作用.

主要成果:

  • 衰老影响血小板数量,功能,表面受体表达和清除标记.
  • 骨髓,肝脏和脏的与年龄相关的变化会影响血小板的产生和去除.
  • 在衰老过程中免疫系统的改变有助于改变血小板的行为和相互作用.

结论:

  • 了解与年龄相关的血小板变化是预防老年人血液静止和血栓并发症的关键.
  • 进一步研究衰老,系统性改变和血小板生命周期之间的相互作用是必要的.
  • 针对与年龄相关的血小板失调可能为血栓形成和相关疾病提供治疗策略.