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receptor |
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a nonapeptide kinin formed from HMW kininogen by the action of kallikrein; it is a very powerful vasodilator and increases capillary permeability; in addition, it constricts smooth muscle and stimulates pain receptors. A pain receptor will make a neuron "fire" only when a specific molecule shows up to activate it. In someone with undamaged pain receptors and circuitry, the unpleasant signal's pathway to the brain begins at nerve endings called |
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