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KembaraXtra-Psychology - axon reflex
An axon reflex explains the skin’s triple response after scratching: a red line appears quickly, then a surrounding flare, then a pale weal. Pain receptors send impulses not only orthodromically toward the CNS but also antidromically into neighbouring branches; endings release substance P, which dilates arteries to create the flare and also stimulates mast cells to release histamine, producing fluid accumulation that forms the weal.
An axon reflex explains the skin’s triple response after scratching: a red line appears quickly, then a surrounding flare, then a pale weal. Pain receptors send impulses not only orthodromically toward the CNS but also antidromically into neighbouring branches; endings release substance P, which dilates arteries to create the flare and also stimulates mast cells to release histamine, producing fluid accumulation that forms the weal.
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