C_S_D 4430 Lecture Notes - Lecture 27: Brainstem, Third Order, Trigeminal Nerve
Document Summary
Located in the tongue, hard and soft palates, the roof of the tongue, and in the gut. Thinks that fake sugar is real sugar but has more harmful effects drinking diet pop is just as bad as regular pop. Specially designed receptor cells are involced in perception of five taste qualities. Flavor arises from the complex integration of the taste qualities plus input from the olfactory and somatosensory systems. Salty tastes arise from salts, containing ions such as na+, k+ and ca++ Sour taste arise form acids which are high in h+ content. These ions pass through ion channels to depolarize the cell directly. Following initial depolarization, voltage-sensitive ca++ ion channels open. Ca++ moves into the cell causing release of nts from synaptic vesicles. Bitter and sweet taste receptors have receptor proteins to which sweet and bitter substances bind. This binding activates a second messenger to depolarize the cell.
