Chemical Senses

Human chemical senses, comprising both olfaction (smell) and gustation (taste), play a fundamental role in our daily experiences and interactions with the environment. Olfaction involves the detection of volatile molecules in the air, while taste primarily pertains to the recognition of various chemical compounds in food and drink. This chapter will discuss the olfactory epithelium in the nasal cavity, which contains specialised receptor cells that interact with odour molecules and are eventually processed by the brain. This process allows us to distinguish a vast array of smells, which in turn influence our perceptions and trigger emotional and memory responses. Gustation is primarily governed by taste buds located on the tongue and in other parts of the mouth. Taste receptors respond to five basic tastes: sweet, sour, salty, bitter, and umami. These receptors help us discern the flavour of foods and beverages, influencing our dietary choices and enjoyment of culinary experiences. The human chemical senses are highly interrelated. Understanding the mechanisms, the psychophysics, and complexities of these chemical senses is pivotal in various fields.