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you see, a reflex action ish a simple action tt your body does wen it ish under a simulation such as wen ur hands touch a hot kettle u will pull back ya hand...dis kinda things are passed down by genes so everyone with their hands on hot kettle will pull back n nt glue there.... well tt a reflex. BUT
if it ish the 1st tym u hear the word ROASTED CHICKEN, u may not hv saliva secreted (btw siliva ish a reflect action), but once u taste Roasted chicken n love it, wen ever u see roasted chicken or even hears the word "roasted chicken", silava will start to build up