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How does smell work on the human body?

You have "smell receptors" in the roof of your nose that extend up into the brain above and between your eyes. There, the chemical signal is turned into an electrical signal in the olfactory bulbs. From the olfactory bulbs the electrical message is transferred to the part of the brain that interprets the smell. They are covered by a layer of watery mucous and so anything that you smell must be able to dissolve in the mucous. Usually the things you are able to smell are volitile, which means they can become a gas or a vapor that can then dissolve and be sensed by the receptors in your nose. The reason that you can smell so many different smells is that these vapors make many different combinations.

K. Van Hoeck

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