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Related Concept Videos

Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
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Factors Affecting Pulmonary Ventilation01:19

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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The Respiratory System01:16

The Respiratory System

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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.
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Asthma-I: Introduction01:29

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Other Pulmonary Disorders01:17

Other Pulmonary Disorders

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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.
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Overview of Respiratory System01:23

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The respiratory system is a complex biological apparatus that facilitates the exchange of gases, specifically oxygen and carbon dioxide, between our bodies and the environment. This system plays a vital role in the physiological process of respiration, an essential function for sustaining life.
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Related Experiment Video

Updated: Sep 9, 2025

Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
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Published on: July 12, 2024

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Particulate matter air pollution: effects on the respiratory system.

Robert B Hamanaka, Gökhan M Mutlu

    The Journal of Clinical Investigation
    |September 2, 2025
    PubMed
    Summary

    Air pollution, particularly particulate matter (PM), causes millions of premature deaths annually and significantly impacts respiratory health, leading to various lung diseases.

    Area of Science:

    • Environmental Health
    • Pulmonology
    • Toxicology

    Background:

    • Air pollution is a complex mixture of gases and particulate matter (PM).
    • PM air pollution is linked to 4.7 million premature deaths yearly and 8% of global disability-adjusted life years.
    • Exposure to PM causes respiratory symptoms and is a major cause of respiratory morbidity and mortality.

    Purpose of the Study:

    • To review epidemiological studies linking air pollution exposure to respiratory diseases.
    • To examine the evidence for PM exposure and lung diseases such as asthma, COPD, and lung cancer.
    • To provide an overview of the mechanisms by which PM affects respiratory health.

    Main Methods:

    • Review of epidemiological studies.
    • Analysis of evidence linking PM exposure to various lung diseases.

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  • Synthesis of current knowledge on PM's biological effects on the respiratory system.

    • Main Results:

    • Significant epidemiological evidence links PM air pollution to increased risk of respiratory diseases.
    • PM exposure is associated with asthma, chronic obstructive pulmonary disease (COPD), pulmonary fibrosis, pneumonia, acute respiratory distress syndrome (ARDS), and lung cancer.
    • Understanding the biological mechanisms of PM's effects is crucial for mitigating respiratory harm.

    Conclusions:

    • Air pollution, especially PM, is a major global health concern with substantial impact on respiratory health.
    • Further research into PM's mechanisms is needed to develop effective interventions.
    • Public health strategies must address air pollution to reduce respiratory disease burden.