What are the two main routes by which asbestos fibers enter the body?

Asbestos fibers primarily enter the body through inhalation and ingestion, making this the correct choice. Inhalation occurs when airborne asbestos fibers are breathed in, which is the most common route of exposure, especially in occupational settings. Once these fibers are inhaled, they can become lodged in the lungs and other parts of the respiratory system, causing various health problems over time, such as asbestosis, lung cancer, and mesothelioma.

Ingestion occurs when asbestos fibers are swallowed, which can happen inadvertently, for example, when fibers are coughed up from the lungs and then swallowed or when contaminated food or drinks are consumed. Although ingestion is less common than inhalation, it is still a significant route by which these harmful fibers can enter the body, contributing to potential health risks.

Understanding these two primary routes—inhalation and ingestion—helps in implementing control measures and awareness programs aimed at preventing asbestos exposure in various environments.