Answer:
When we smell anything, our nose detects microscopic fragments of that object (for example, we can perceive the aroma of a flower because tiny fragments of the flower are in the air). These little fragments are known as odour molecules. When our nose senses odour molecules, they travel to the olfactory bulb, a particular area of our brain. This is the location where the scent is initially processed. The signal is then sent to other regions of our brain, such as the olfactory cortex, which helps us distinguish various smells, and the amygdala, which helps us correlate odours with emotions (for example, a certain fragrance may remind you of a good memory). Finally, the signal reaches the hippocampus, which is critical for remembering.