The gustatory system or sense of taste is the sensory system that is partially responsible for the perception of taste. Taste, along with the sense of smell and trigeminal nerve stimulation registering texture, pain, and temperature , determines flavors of food and other substances.
Humans have taste receptors on taste buds and other areas, including the upper surface of the tongue and the epiglottis. The tongue is covered with thousands of small bumps called papillae , which are visible to the naked eye.
There are between and [ 5 ] taste buds that are located on the back and front of the tongue. Others are located on the roof, sides and back of the mouth, and in the throat. Each taste bud contains 50 to taste receptor cells. Taste receptors in the mouth sense the five basic tastes: sweetness , sourness , saltiness , bitterness , and savoriness also known as savory or umami. Taste buds are able to tell different tastes apart when they interact with different molecules or ions. Sweetness, savoriness, and bitter tastes are triggered by the binding of molecules to G protein-coupled receptors on the cell membranes of taste buds.
Saltiness and sourness are perceived when alkali metals or hydrogen ions meet taste buds, respectively. The basic tastes contribute only partially to the sensation and flavor of food in the mouth—other factors include smell , [ 1 ] detected by the olfactory epithelium of the nose; [ 10 ] texture , [ 11 ] detected through a variety of mechanoreceptors , muscle nerves, etc.
As the gustatory system senses both harmful and beneficial things, all basic tastes bring either caution or craving depending upon the effect the things they sense have on the body. Among humans, taste perception begins to fade during ageing , tongue papillae are lost, and saliva production slowly decreases. Not all mammals share the same tastes: some rodents can taste starch which humans cannot , cats cannot taste sweetness, and several other carnivores , including hyenas , dolphins , and sea lions , have lost the ability to sense up to four of their ancestral five basic tastes.
