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Related Concept Videos

The Respiratory System01:16

The Respiratory System

The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.
Other Pulmonary Disorders01:17

Other Pulmonary Disorders

Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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...
Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
Pleura of the Lungs01:13

Pleura of the Lungs

The lungs are nestled in a cavity, shielded by the pleura. The pleura, a form of serous membrane, wraps around each lung. This membrane arrangement consists of two layers: the visceral and parietal pleurae. The visceral pleura lines the surface of the lungIn contrast, the parietal pleura is the outer layer and contacts to the thoracic wall, the mediastinum, and the diaphragm. The hilum is the point of connection between the visceral and parietal layers. The space between the parietal and...
Gross Anatomy of the Lungs01:17

Gross Anatomy of the Lungs

The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...

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Related Experiment Video

Updated: Jun 13, 2026

Isolation of Mouse Respiratory Epithelial Cells and Exposure to Experimental Cigarette Smoke at Air Liquid Interface
10:47

Isolation of Mouse Respiratory Epithelial Cells and Exposure to Experimental Cigarette Smoke at Air Liquid Interface

Published on: February 21, 2011

When smoke gets in your lungs.

John R Balmes1

  • 1UCSF, Box 0843, San Francisco, CA 94143-0843, USA. john.balmes@ucsf.edu

Proceedings of the American Thoracic Society
|April 30, 2010
PubMed
Summary
This summary is machine-generated.

Indoor air pollution from biomass cooking fires significantly impacts global health, causing millions of deaths annually. Research is ongoing to address data gaps in exposure and health effects.

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Area of Science:

  • Environmental Health
  • Public Health
  • Epidemiology

Background:

  • Household air pollution from inefficient biomass fuel combustion is a major health risk in developing nations.
  • Exposure levels to particulate matter in homes using biomass fuels are significantly higher than ambient air pollution in developed countries.
  • Biomass fuel includes wood, crop residues, and animal dung, burned for cooking in poorly ventilated environments.

Discussion:

  • Indoor air pollution from solid fuel use contributes to 2.6% of the global disease burden and causes 1.5-2 million deaths yearly.
  • Key health impacts include acute lower respiratory infections in children and chronic obstructive pulmonary disease in adult women.
  • Existing research is limited by a lack of actual exposure measurements, longitudinal data, and intervention studies.

Key Insights:

  • Approximately half the world's population relies on unprocessed biomass fuels for daily cooking, highlighting the vast public health implications.
  • The World Health Organization estimates significant mortality and morbidity linked to indoor air pollution from solid fuel use.
  • Addressing data gaps in exposure assessment and health outcomes is critical for effective interventions.

Outlook:

  • Ongoing research in Guatemala aims to fill critical data gaps regarding biomass fuel exposure and health impacts.
  • Future studies should focus on longitudinal assessments and intervention effectiveness.
  • Improved cooking technologies and ventilation strategies are essential for mitigating health risks.