What are the functional roles of the maxillary sinus?

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Reducing the weight of the skull and secreting bactericidal lysozyme into the nasal passagesShielding the brain from cold air by temporarily trapping air within the sinusContributing to voice resonance and increasing the skull's resistance to mechanical impactAll of the above

Explanation

The maxillary sinus serves multiple functions including decreasing the skull's weight, producing bactericidal lysozyme to protect the nasal cavity, protecting the brain from cold air by temporarily holding air within the sinus, and aiding in voice resonance as well as strengthening the skull against mechanical shocks. Therefore, all these roles collectively define its functional importance.