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Alveoli and Alveolar Ducts

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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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Related Experiment Video

Updated: Jun 21, 2026

Nanoscopic Imaging of Human Tissue Sections via Physical and Isotropic Expansion

Nanoscopic Imaging of Human Tissue Sections via Physical and Isotropic Expansion

Published on: September 25, 2019

Alveolar expansion imaged by optical sectioning microscopy.

Carrie E Perlman¹, Jahar Bhattacharya

¹Department of Medicine and Physiology, College of Physicians and Surgeons and St. Luke's-Roosevelt Hospital Center, Columbia University, New York, New York 10019, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)

|June 23, 2007

Summary

This summary is machine-generated.

Lung alveoli expand unevenly during inflation, with some segments stretching more than others. This heterogeneous alveolar distension, particularly in alveolar type 1 cells, may increase injury risk during overinflation.

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Area of Science:

Pulmonary physiology
Biomechanics
Cell biology

Background:

Alveolar distension patterns are crucial for lung function, influencing processes like surfactant secretion.
The specific mechanical behavior of alveolar perimeter segments during lung expansion is not well understood.

Purpose of the Study:

To investigate the micromechanics of alveolar perimeter distension in isolated rat lungs.
To characterize the segmental heterogeneity of alveolar expansion during lung inflation.

Main Methods:

Real-time confocal microscopy was used on isolated, perfused rat lungs.
Alveolar epithelial cells were fluorescently labeled and microinjected for imaging.
Image analysis quantified segment lengths (L(seg)) at baseline and hyperinflated pressures.

Main Results:

Mean alveolar segment length increased by 14% upon hyperinflation (5 to 20 cmH(2)O alveolar pressure).
Alveolar distension was heterogeneous, varying even within single alveoli.
Alveolar type 1 epithelial cells exhibited greater distension than type 2 cells.

Conclusions:

Alveoli expand non-uniformly, with significant segmental heterogeneity in distension.
Greater distension in specific segments may predispose them to injury during lung overdistension.
Findings highlight the importance of micromechanical patterns in alveolar function and injury.