Nose can memorize around 50000 types of aromas. Researchers reveal that human eyes can differentiate among thousands of colors and ears millions of sounds. Although our nose is an incredibly stiffing, sometimes we are barely aware of the smell we sense. The researchers from Rockefeller University and the Howard Hughes Medical Institute (HHMI) researched on volunteers, and concluded that our sniffers can easily make out the difference when exposed to various kinds of odors. This research clearly testifies that our nose is the sensitive part of the body.
The number of smells detected and memorized was uncertain by some of the scientists. The reason was that the human eye uses 3 receptors to see so many colors, while our nose uses 400 olfactory receptors to retain the smells. The result is observed by various other factors which help in analyzing these different fragrances.
How can this small nose differentiate among various colors?
There is a process which is followed inside our nose to distinguish the smells. The atmospheric air entering the body is different in warmth and moisture from the air inside the body. The composite interior of the nose expands the exterior of the respiration area and takes out air to reach the lubricated tissues coating the nasal opening. Hairs and slimy texture on the inner part also filters the wastes before it enters the lungs. This air moistens before reaching the lungs. As this air respires from the lungs, it goes back via nose where its moisture and heat is locked in by the skin and used to moisten the next breath of air.
Some of the air passing the nose goes over the olfactory epithelium, whose thin coating of mucus blocks some of the particles. These particles then come in touch with olfactory hairs extending from olfactory receptor neurons in the epithelium. Odorant molecules rouse the olfactory receptor neurons to create a combat activity, which slides sideways their axons through gaps in the ethmoid bone to the olfactory storage organ. Neurons in the olfactory bulb have the combat ability and transmit the nerve indications into the olfactory area of the brain where the information is translated and signaled to give sense of smell.