<P> Combinations of these receptors in dimers or other complexes contributes to different perceptions of taste . </P> <P> Visual, olfactive, "sapictive" (the perception of tastes), trigeminal (hot, cool), mechanical, all contribute to the perception of taste . Of these, transient receptor potential cation channel subfamily V member 1 (TRPV1) vanilloid receptors are responsible for the perception of heat from some molecules such as capsaicin, and a CMR1 receptor is responsible for the perception of cold from molecules such as menthol, eucalyptol, and icilin . </P> <P> The gustatory system consists of taste receptor cells in taste buds . Taste buds, in turn, are contained in structures called papillae . There are three types of papillae involved in taste: fungiform papillae, foliate papillae, and circumvallate papillae . (The fourth type - filiform papillae do not contain taste buds). Beyond the papillae, taste receptors are also in the palate and early parts of the digestive system like the larynx and upper esophagus . There are three cranial nerves that innervate the tongue; the vagus nerve, glossopharyngeal nerve, and the facial nerve . The glossopharyngeal nerve and the chorda tympani branch of the facial nerve innervate the TAS1R and TAS2R taste receptors . </P> <P> In 2010, researchers found bitter receptors in lung tissue, which cause airways to relax when a bitter substance is encountered . They believe this mechanism is evolutionarily adaptive because it helps clear lung infections, but could also be exploited to treat asthma and chronic obstructive pulmonary disease . </P>

Where are the taste bud receptors for detecting sweet
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