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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.
Lesson Summary. Chemoreceptors are the receptors found on sensory organs that interact with chemicals. They sit on the outside of a cell (the cell membranes) and are designed to detect specific molecules called ligands.