Question

what are the two primary functions of the sinuses? check all of the boxes that apply.
□ they allow the passage of food.
□ they filter out foreign particles in the air.
□ they reduce the weight of the skull.
□ they increase the loudness of the voice.
retry

Explanation:

1. Analyze each option:

• "They allow the passage of food": Sinuses are related to the respiratory system and skull, not food passage (that's the digestive system's role like the esophagus). So this is incorrect.
• "They filter out foreign particles in the air": The nasal cavity and its mucous membranes/cilia filter particles, not the sinuses primarily. So this is incorrect.
• "They reduce the weight of the skull": Sinuses are air - filled cavities in the skull bones, which helps in reducing the overall weight of the skull. This is a correct function.
• "They increase the loudness of the voice": The sinuses act as resonating chambers, which helps in increasing the loudness and quality of the voice. This is a correct function.

Answer:

• They reduce the weight of the skull.
• They increase the loudness of the voice.