What are the three protective mechanisms the body uses against asbestos fibers?

The correct answer highlights three key protective mechanisms used by the body to defend against asbestos fibers: the cough reflex, cilia, and the immune system.

The cough reflex is crucial because it serves as a first line of defense; when asbestos fibers are inhaled, the body can trigger a cough to expel these foreign particles from the respiratory system. This reflex helps clear out irritants, including harmful substances, before they can cause significant damage.

Cilia, which are tiny hair-like structures lining the respiratory tract, play a vital role in moving mucus that traps inhaled particles and pathogens upwards towards the throat, where they can be swallowed or coughed out. This action helps prevent the accumulation of asbestos fibers in the lungs, thereby minimizing the risk of respiratory issues.

The immune system also plays an integral role in protecting the body from asbestos exposure. It identifies and responds to inhaled fibers that may cause harm. Immune cells will attempt to engulf and destroy these foreign materials, thereby reducing the potential for inflammation and disease.

Together, these mechanisms form a comprehensive defense against the harmful effects of asbestos exposure, illustrating how the body attempts to maintain respiratory health in the presence of these harmful substances. The functions described in the other options do not specifically pertain to