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Alveoli and Alveolar Ducts

Alveoli and Alveolar Ducts

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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Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.

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Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...

Cellular Adaptation IV: Dysplasia and Metaplasia

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Atypical Pneumonia

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Related Experiment Video

Updated: Jul 17, 2026

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

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

Published on: May 6, 2020

Alveolar adenoma.

Eduardo Haruo Saito¹, Luciana Ribeiro de Aaraujo, Leonardo Hoehl Carneiro

¹Universidade Estadual do Rio de Janeiro, School of Medical Sciences, Rio de Janeiro, Rio de Janeiro, Brazil. eduardosaito@uol.com.br

Jornal Brasileiro De Pneumologia : Publicacao Oficial Da Sociedade Brasileira De Pneumologia E Tisilogia

|February 3, 2007

Summary

Alveolar adenoma is a rare benign lung neoplasm. Diagnosis is often incidental via chest X-ray, with surgical resection as the standard treatment.

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Studying the Role of Alveolar Macrophages in Breast Cancer Metastasis

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Published on: June 26, 2016

Area of Science:

Pulmonology
Oncology

Background:

Alveolar adenoma is an uncommon benign lung neoplasm.
Few cases are documented in medical literature.

Observation:

Patients are often asymptomatic.
Diagnosis typically occurs incidentally through chest X-rays revealing a solitary, well-defined nodule.

Findings:

Histological examination confirms the diagnosis.
Surgical resection of the nodule is the primary treatment modality.

Implications:

Highlights the importance of incidental findings on imaging.
Emphasizes surgical management for this rare benign tumor.
Contributes to understanding rare pulmonary neoplasms.