BOW

Receptor cells in your tastes buds, send messages through sensory nerves to your brain. Your brain then tells you what flavors you are tasting. Taste buds recognize four basic kinds of tastes: sweet, salty, sour, and bitter. The salty/sweet taste buds are located near the front of your tongue; the sour taste buds line the sides of your tongue; and the bitter taste buds are found at the very back of your tongue. In addition to taste buds, your sense of smell greatly aids your ability to taste. When you eat or drink, first they smell the aroma released from the product that provides an anticipation of the flavor they are about to taste. As you chew, you force air through your nasal passages, carrying the smell of the food along with it.

http://www.entnet.org/HealthInformation/smellTaste.cfm