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Nociceptive (pain-detecting) nerve fibres are equipped with transducers - in the form of proteins or other structures - that alter their conformation or activity in response to the stimulus to which they are sensitive. This invariably leads to an ingress of charges (usually sodium ions) into the nerve ending resulting in what are dubbed "generator potentials". These depolarise the nerve ending. If the depolarisation is of sufficient magnitude to reach the firing threshold, voltage-sensitive ion channels are activated and the generator potentials become action potentials which are transmitted centripetally along the axon.The more APs that are generated, the greater the perceived intensity of the pain, or, in the case of thermo-receptors, the higher the registered temperature.Chris