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相关概念视频

Formation of the Platelet Plug01:22

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 Platelets01:18

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...
Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Clot Retraction and Fibrinolysis01:16

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.
Membrane Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...

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相关实验视频

Updated: Jul 12, 2026

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
11:42

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

重叠的血小板:在一个远距离的游泳膀中的扩散屏障.

D S Brown, D E Copeland

    Science (New York, N.Y.)
    |July 22, 1977
    PubMed
    概括

    鱼的游泳膀中的血小板形成一个物理屏障,增强气体保留. 这种结构提高了气体压力调节的效率,在physoclistous游泳膀.

    科学领域:

    • 鱼类学 鱼类学 鱼类学
    • 比较生理学比较生理学
    • 生物物理学的生物物理.

    背景情况:

    • 状游泳膀是充满气体的器官,对于许多鱼类的浮力控制至关重要.
    • 游泳膀壁的结构在调节气体交换和压力维持方面发挥着至关重要的作用.
    • 了解游泳膀的微观结构是解释其生理功能的关键.

    研究的目的:

    • 为了研究血小板在体内的结构安排 physoclistous 游泳膀壁.
    • 阐明血小板分层在气体分子扩散中的作用.
    • 确定这种安排如何有助于有效保持气体压力.

    主要方法:

    • 对游泳膀壁组织进行显微镜检查.
    • 血小板排列和分层的分析.
    • 通过游泳膀壁的气体扩散通路的建模.

    主要成果:

    • 叠加的血小板在游泳膀壁的结缔组织中密集地分层.
    • 这种分层的血小板排列为气体分子创造了一条曲折的路径.
    • 血小板形成的物理屏障大大阻碍了气体扩散.

    结论:

    更多相关视频

    Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
    11:18

    Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

    Published on: April 2, 2013

    Microfluidics in Assessing Platelet Function
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    Microfluidics in Assessing Platelet Function

    Published on: November 8, 2024

    相关实验视频

    Last Updated: Jul 12, 2026

    Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
    11:42

    Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

    Published on: July 10, 2017

    Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
    11:18

    Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

    Published on: April 2, 2013

    Microfluidics in Assessing Platelet Function
    06:47

    Microfluidics in Assessing Platelet Function

    Published on: November 8, 2024

    • 血小板在生体性游泳膀中的独特排列,可以作为气体扩散的有效屏障.
    • 这种结构性适应导致气体压力更有效地保持,这对于浮力至关重要.
    • 这些发现突显出一个关键的生物物理机制,它是远鱼中游泳膀功能的基础.