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Paranasal sinuses
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==Functions== {{Needs expansion|date=April 2024}} One known function of the paranasal sinuses is the production of [[nitric oxide]], which also functions as a facilitator of oxygen uptake.<ref name="pubmed">{{cite journal|title=Nitric oxide and the paranasal sinuses|first1=Jon O|last1=Lundberg|journal=The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology|date=November 2008|volume=291|issue=11|pages=1479β1484|doi=10.1002/ar.20782|pmid=18951492|doi-access=free}}</ref>
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