What is another function of the paranasal sinuses besides acting as shock absorbers?

The paranasal sinuses play a crucial role in the immune system by helping to filter and humidify the air we breathe. They contain mucous membranes that can produce mucus, which traps dust, pathogens, and other potential irritants. This process not only helps in protecting the respiratory passages but also assists in the immune response by facilitating the action of immune cells present in the mucus. In addition, the sinuses can communicate with the nasal cavity, allowing for an efficient drainage system that further aids in keeping airborne pathogens at bay.

Other options do not align with the functions of the paranasal sinuses. Processing visual information is primarily the role of the visual system and the brain. Digestion is the responsibility of the gastrointestinal tract, and saliva production is managed by salivary glands. Thus, the immune function attributed to the paranasal sinuses is significant and supports overall respiratory health.