Chemical pain, on the other hand, results from the stimulation of nociceptors via various inflammatory mediators / chemicals. (robdaquila.com)
In most animals, exposure to acid stimulates special channels at the tips of sensory neurons called nociceptors. (newscientist.com)
The researchers doused nociceptors from naked mole rats and mice in acid, and found the strength of the pain signal passing through the NaV1.7 channels dropped by 42 per cent in mice, but by 63 per cent in the mole rats. (newscientist.com)