Paranasal sinuses are believed to have which functions?

Paranasal sinuses are believed to have which functions?

• A. Sound Production
• B. Provide Mucus
• C. Both Sound Production and Provide Mucus
• D. Lighten the Weight of Skull Bones

Answer: (C)

Paranasal sinuses are air-filled spaces in the skull that are lined with mucous membranes. They produce mucus that drains into the nasal cavity, helping to humidify and filter inhaled air. They also act as resonating chambers, influencing the quality and projection of the voice during speech. Because the question asks about their believed functions, the two most emphasized roles are mucus production and voice resonance, so the option that includes both best captures their main functional contributions. Lightening the weight of skull bones is another proposed benefit, but it does not directly address the mucus production and resonance aspects highlighted here, so it isn’t the best single answer when two functions are being considered.

Paranasal sinuses are air-filled spaces in the skull that are lined with mucous membranes. They produce mucus that drains into the nasal cavity, helping to humidify and filter inhaled air. They also act as resonating chambers, influencing the quality and projection of the voice during speech. Because the question asks about their believed functions, the two most emphasized roles are mucus production and voice resonance, so the option that includes both best captures their main functional contributions. Lightening the weight of skull bones is another proposed benefit, but it does not directly address the mucus production and resonance aspects highlighted here, so it isn’t the best single answer when two functions are being considered.