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Sour receptors detect the protons (H +) liberated by sour substances (acids). This closes transmembrane K + channels which leads to depolarization of the cell [ Link ], and the release of the neurotransmitter serotonin into its synapse with a sensory neuron.umans detect taste with taste receptor cells. These are clustered in taste buds and scattered in other areas of the body. Each taste bud has a pore that opens out to the surface of the tongue enabling molecules and ions taken into the mouth to reach the receptor cells inside. 1  salty. 2  sour. 3  sweet. 4  bitter.
1 The cilia of the sensory neurons are immersed in a layer of mucus. 2  Odorant molecules (molecules that we can smell) dissolve in the mucus and. 3  bind to receptors on the cilia.4  These are 7-pass transmembrane proteins. 5  Binding of the odorant activates a G protein coupled to the receptor on its cytoplasmic side. Odorant molecules (molecules that we can smell) dissolve in the mucus and. 2  bind to receptors on the cilia. 3  These are 7-pass transmembrane proteins. 4  Binding of the odorant activates a G protein coupled to the receptor on its cytoplasmic side.