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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.
A signaling pattern recognition receptor, the second type of receptor, binds microbial molecules and receptors together. These receptors recognize pathogens or antigens based on patterns of molecular activity. This binding triggers the production of cytokines. signaling pattern recognition receptor can be on the surface of immune cells or within cell membranes. These receptors can also be located in the cytoplasm or secreted in tissue fluids and plasma.