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Alveoli and Alveolar Ducts01:26

Alveoli and Alveolar Ducts

4.8K
The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...
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Capillaries and Their Types01:20

Capillaries and Their Types

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Venules01:08

Venules

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Venules are an integral part of the microscopic circulatory system that bridges the gap between capillaries and veins.
Venules are much smaller in diameter compared to their larger counterparts, the veins. They are generally 8 to 100 micrometers in diameter, significantly smaller than the size of veins. The walls of venules are thin, consisting of the endothelium, a thin layer of connective tissue, and occasionally a few smooth muscle cells. This structural simplicity is a stark contrast...
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Microvilli00:55

Microvilli

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Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
These microvilli are predominantly present in cells lining the small intestine, kidney tubules, and certain cells in the respiratory and reproductive systems. By significantly expanding the surface area of the cell membrane, microvilli enhance the cell's capacity...
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Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Diversity of Protists II01:27

Diversity of Protists II

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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関連する実験動画

Updated: Dec 5, 2025

Author Spotlight: Studying Spatial Protein Expression Using Agarose Embedded Lung Tissue Sections
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アルベオルの毛細血管細胞型特異化

Astrid Gillich1,2,3, Fan Zhang3, Colleen G Farmer4

  • 1Department of Biochemistry and Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA.

Nature
|October 15, 2020
PubMed
まとめ

哺乳類の肺

さらに関連する動画

Multicellular Human Alveolar Model Composed of Epithelial Cells and Primary Immune Cells for Hazard Assessment
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Multicellular Human Alveolar Model Composed of Epithelial Cells and Primary Immune Cells for Hazard Assessment

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Author Spotlight: Developing a Microfluidic Lung-on-Chip Model for In-Depth Study of Human Immune Response and Infection Mechanisms
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関連する実験動画

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Author Spotlight: Studying Spatial Protein Expression Using Agarose Embedded Lung Tissue Sections

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Multicellular Human Alveolar Model Composed of Epithelial Cells and Primary Immune Cells for Hazard Assessment
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Author Spotlight: Developing a Microfluidic Lung-on-Chip Model for In-Depth Study of Human Immune Response and Infection Mechanisms
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科学分野:

  • 肺生物学と細胞生物学
  • 血管や心臓血管に関する研究
  • 進化生物学

背景:

  • 状毛細血管は ガス交換のための 重要な空気-血液バリアを形成します
  • 以前の理解では,均質な毛細血管内皮が想定されていた.
  • アルベオラ毛細血管ネットワーク内の細胞の多様性と機能は未調査であった.

研究 の 目的:

  • シングル・セル分析を用いてアルベオラ毛細血管内皮内の異なる細胞タイプを特定する.
  • これらの特殊な内皮細胞の発達,再生,進化の起源を調査する.
  • 肺の健康と疾患における内皮細胞の専門化の機能的意味を理解する.

主な方法:

  • 単細胞RNAシーケンシングと空間トランスクリプトミクス
  • 種間の比較分析 (マウス,人間,ワニ,カメ)
  • インサイトハイブリデーションと免疫光染色.

主要な成果:

  • アルベオラ毛細血管内皮細胞の2つの異なるタイプの発見:エアロサイトと一般的な毛細血管 (gCap) 細胞.
  • エアロサイトは ガス交換と白血球の密輸に特化したもので 肺に特有です
  • GCAP細胞は血管運動を調節し,毛細血管修復のための幹細胞/祖先細胞として機能する.
  • 細胞型の専門化は徐々に発展し,哺乳類に保存され,爬虫類には存在しないので,哺乳類の起源を示唆する.
  • これらの細胞タイプは 老化や病気に対して 異なる反応を示します

結論:

  • アルベオラ毛細血管は異質で,特殊なエアロサイトとGCAP細胞で構成されています.
  • この細胞の特異化は 血液-空気バリア機能,ホメオスタシス,修復に不可欠です
  • この発見は哺乳類の肺血管に 重要な進化的適応を示しています