College of Massage Therapists of British Columbia (CMTBC) Practice Exam

What causes pneumoconiosis, commonly referred to as 'dusty lungs'?

1. Inhalation of water vapor

2. Inhalation of asbestos or silica

3. Exposure to chemical fumes

4. Viral infections

The correct answer is: Inhalation of asbestos or silica

Pneumoconiosis, or 'dusty lungs,' is primarily caused by the inhalation of certain inorganic dusts, notably asbestos and silica. These substances can lead to chronic respiratory conditions as the body’s immune response attempts to deal with these foreign particles. Over time, the accumulation of these dusts in the lungs can result in inflammation and scarring, significantly affecting lung function. This chronic response to inhaled particulate matter is the hallmark of pneumoconiosis, making the inhalation of asbestos or silica the correct cause of this condition. Other potential causes listed, such as water vapor, chemical fumes, and viral infections, do not typically lead to pneumoconiosis. Water vapor doesn’t have the particulate nature required to cause this disease, while chemical fumes may have different health implications, they are not specifically associated with pneumoconiosis. Viral infections can cause respiratory conditions but are not related to the chronic inhalation of dust that defines pneumoconiosis.