Occupational Safety and Health Administration. 1  Department of Labor, Labor Department, DoL, Labor - the federal department responsible for promoting the working conditions of wage earners in the United States; created in 1913.
The oxygen and carbon dioxide exchange take place in the alveoli. Primary bronchi are located on the upper portion of the lungs, secondary bronchi is located at the center of the lungs and tertiary bronchi is located near bottom of the organs above the bronchioles.
Bronchiolitis, bronchitis, and pneumonia are all words that denote the location in the body of a problem. Bronchiolitis refers to inflammation in the bronchioles, the smaller airways that branch off from the main bronchi or breathing tubes. Bronchitis is inflammation in these larger, main breathing tubes.