Why does disinfectant/sanitizer burn when it gets into a cut? (not hydrogen peroxide)
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Disinfectant means it’s something that kills living bacteria cells. You’re made up of living cells too, if some cells on the skin surface die you don’t care, that’s pretty much their purpose to die protecting internals. But if it gets into cuts it kills some cells that aren’t supposed to die, so you feel the pain signaling about that
when current flows into body it stimulates sensory receptors. for this to happen voltage needs to be >70mV, which is tiny. in body charges are ballanced, so you’re not in constant pain (hopefully). now, alcohol disrupts cell membranes, basically destroys cell. so everything that was balanced becomes more imbalanced, charges as well. if the electric potential difference is enough your receptors get stimulated like there was actual activation, wound literally becomes little Galvanic cell, current passes and you get strong tingling feeling that your brain translates as a pain, because main idea of sensory receptor at lets say finger was to detect pain. but if you lick the 9v battery you taste soury, savory, salty, all the tastes that your tongue ever sensed, even though the same thing is happening and the receptorc get activated the same way. worths mentioning, sensors in body are also activated by actual electric current, so we are voltage generators (sort of)
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