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.
The trachea and bronchi form the tracheobronchial tree. The trachea is situated between the lower end of the larynx and the center of the chest, where it splits into the two bronchi at a ridge called the carina.he most common tracheal injury is a tear near the carina or in the membranous wall of the trachea. In blunt chest trauma, TBI occurs within 2.5 cm of the carina 40â80% of the time. The injury is more common in the right main bronchus than the left, possibly because the former is near vertebrae, which may injure it.