How do humans smell? Explained! The process of smelling! Interesting to know!
Many animals live in a world dominated by smells. Probably this was the first of the senses to develop among living things.
In the human face, the outside nose is obvious. But there is another nose in the upper nostrils. On its sides, a spot about the size of nayapaisa, contains special nerve cells. Even though our nose cannot distinguish smells very well, it can detect remarkably minute concentrations of odors. The chemoreceptors lie there. Embedded in this tissue are several million chemoreceptors. They are long, thin cells with hairlike cilia forming a web lying on the surface of the tissue that is bathed in mucus. These receptors are connected to a part of the brain called the olfactory bulb. The olfactory bulb of a dog is much larger than that of man!
The scent molecules pass from the air traveling up the nose to mucus, where they stimulate the chemoreceptors. The smell center in the brain receives the messages and tell us what we are smelling.