Britannica
Sources used in this answer
- respiratory disease - Defenses of the respiratory system
- childhood disease and disorder - Respiratory disorders
- respiratory disease
- respiratory disease - Morphological classification of respiratory disease
- respiratory disease - Air pollution
- respiratory disease - Allergic lung diseases
- respiratory disease - Viral infections of the respiratory system
- What are the five ways infectious diseases can be spread?
Why is the respiratory tract especially vulnerable to disease?
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respiratory disease
The bronchioles of the lungs are the site where oxygen is exchanged for carbon dioxide during the process of respiration. Inflammation, infection, or obstruction of the bronchioles is often associated with acute or chronic respiratory disease, including bronchiectasis, pneumonia, and lung abscesses.
The respiratory tract is uniquely vulnerable to disease due to three primary factors:
- Environmental Exposure: Because the respiratory tract is constantly exposed to the outside environment, it is frequently subjected to inhaled organisms, dust, and gases that can cause infection or irritation.1
- Vascular Connectivity: The lungs contain a vast network of capillaries that process the entire output of the heart. Consequently, systemic diseases affecting small blood vessels are highly likely to impact the lungs.1
- Allergic Sensitivity: The respiratory system is a frequent site for allergic or "sensitivity" phenomena. The lungs are particularly prone to these responses because they are exposed to inhaled allergens, contain smooth muscle in the bronchial tree that reacts to inflammatory chemicals like histamine, and possess a large vascular bed that can be involved in general inflammatory responses.12
While the respiratory tract possesses a comprehensive series of defenses—including cilia, mucus, and macrophages—these inherent vulnerabilities make it a site for an exceptionally wide range of disorders.31