SENSE OF SMELL

1. Smells are actually chemicals present in the air.

2. The nose can detect these chemicals.

3. The smell receptors or sensory cells are located at the roof of the nasal cavity. This position allows the 
    smell receptor to have the maximum exposure to the air current.

4. How smells are detected;
a) When air is breathed in, the air current passes through the nasal cavity. The
    chemicals present in the air dissolve in the mucous lining and stimulate the
    smell receptor.
b) These receptors send out nerve impulses to the brain. The brain interprets
    the message and identify the smells.