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Paranasal sinuses are part of the upper respiratory system.

Paranasal sinuses are part of the upper respiratory system.
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Description: From here, infections can spread via the nasopharynx to the middle ear or bronchi. Note locations of laryngitis, pharyngitis, sinusitis, and tonsillitis.
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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=9269
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