alleryStart learning →Apart from warming and humidifying air, what do the paranasal sinuses do?
AThey drain tears from the eye socket
BThey anchor the septum to the vomer
CThey detect odours deep in the cavity
DThey make mucus and lighten the skull
Answer & Solution
Correct answer: D. They make mucus and lighten the skull
1. The paranasal sinuses are air-containing spaces inside bones that help form the nasal cavity walls.
2. Their first role is warming and humidifying incoming air.
3. They also produce mucus and lighten the weight of the skull, which is the correct answer.
4. Odour detection belongs to the olfactory epithelium found deeper in the nasal cavity, so the third option is wrong.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_
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