Module 10: Figure taste receptor cells
Taste receptors cells.
Within each cup-shaped taste bud there are three main taste receptor types. Type I glial-like cells appear to act by supporting the activity of the other two cell types. Type II receptor cells respond to sweet, bitter or umami stimuli by recruiting the InsP3/Ca2+ signalling pathway to release the transmitter ATP that has a number of actions. Type III presynaptic cells respond to ATP by inducing the action potentials responsible for releasing the transmitter 5-HT that acts to stimulate the sensory afferent fibres. This figure is based on information contained in Figure 3 of Chaudhari and Roper (2010). I would like to thank Nirupa Chaudhari and Stephen Roper for all their help in designing this figure.