This document discusses the senses of taste and smell (chemosenses). It notes that chemosenses provide survival value by allowing animals to detect chemicals in the air and dissolved in saliva. While some molecules can have similar structures but different smells, others can have different structures but be identified as the same smell. The human nose contains over 350 types of olfactory receptors that each detect particular odor groups. Taste is detected on the tongue by taste buds in specific areas. Both taste and smell involve complex neural processing and perception.