is one of the five senses of the human body
, along with touch, smell
, sight, and hearing. The receptors distinguish between different tastes
by means of some 4000 sensory cells
, 75% of which are located on the tongue. They relay the information they pick up to the prefrontal cortex of the brain via four different nerves, a process that takes less than 150 milliseconds. The tongue's taste buds enable us to distinguish between salty, sweet, acidic, bitter, and glutamate acid tastes, and decrease in number with age.