How stimulus detected by nose?

Stimuli are detected by the nose through specialized sensory cells called olfactory receptors located in the olfactory epithelium. When odor molecules bind to these receptors, they trigger a biochemical response that generates electrical signals. These signals are then transmitted to the olfactory bulb in the brain, where they are processed and interpreted as specific smells. This complex process allows us to perceive and differentiate a wide array of odors.