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Receptors for Smell
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Description
Airborne chemical molecules (vapors) enter the nose and circulate through the nasal cavity, where the smell receptors are located. The receptors’ axons make up the olfactory nerve, which carries signals to the brain. When you sniff, you draw more vapors into the nose and speed their circulation. Vapors can also reach the nasal cavity through the mouth by way of a passageway from the throat.
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