The <u>olfactory system</u> is the sensory system responsible for the sense of smell. When you sniff something, you are actually sucking tiny particles called <u>aromatic substances</u> into your nose. The nasal cavity is the area filled with air behind your nose. <u>Aromatic substances</u> pass through the nasal cavity to the olfactory bulb, which contains sensory receptors that receive the <u>aromatic substances</u>. The receptors in the olfactory bulb send signals to the brain