As food enters our mouth, we bite and chew it and press it against the palate with our tongue. This releases the chemicals in food that trigger off our taste buds to act and carry stimulus to the brain to be processed for recognition of taste. The same taste bud is capable of producing different signals corresponding to the different chemicals in food. Taste receptors cluster in small mucous- membrane projections called papillae. Each is especially sensitive to molecules of a particular shape.