The cartilage rings are C-shaped because the back of the trachea presses against the esophagus. The cartilage opens at the esophagus and is replaced by connective tissue and muscle. This gives the esophagus space to allow food to be swallowed easily. The rings of the trachea are stacked one on top of the other, with a small space between them.
In 2014, a survey of the Australian working population revealed that the most common carcinogenic exposures in the workplace were solar ultraviolet radiation, diesel engine exhaust, environmental tobacco (second-hand) smoke, benzene, lead and silica.
Occupational exposure to n-hexyl acetate may occur through inhalation and dermal contact with this compound at workplaces where n-hexyl acetate is produced or used. Monitoring data indicate that the general population may be exposed to n-hexyl acetate via ingestion of food sources that contain this compound. (SRC)