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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) more receptor cells. bloodhounds' olfactory epithelium is 60 cm 2, contains300 million receptor cells, can detect much lower amounts 2) more kinds of receptors3) larger portion of their brains are devoted to processing smellcan detect odors that we can'tcan put it all together.