taste bud with receptor cells. types of taste receptors. cell membrane and ion channels for sour, salty, sweet, umami

anatomical anatomy area basal basic bitter bud buds cation cell cells channel channels cross depicts diagram different education epithelium health healthy human hydrogen illustration ion lingual medical medicine membrane microvilli molecule mouth nerve neurotransmission oral papilla papillae pathway receptor receptors salty science section sense sensory signal sodium sour specific sweet taste this tongue transduction type types umami vector