Category: Oral Histology

A. Lightening of skull weight and production of bactericidal lysozyme to the nasal cavity
B. Protects the brain against exposure to cold air by arresting air in sinus temporarily
C. Resonance of voice and enhancement of faciocranial resistance to mechanical shock
D. All of the above

A. Opens in to the inferior meatus of nose
B. Has the 1st molar projecting into its floor
C. Is fully developed by the age of 8 years
D. Has good drainage in upright position

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