BeKind
Forum Newbie
Topics: 5
Posts: 21
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Hi everybody! I have a problem, can't find the right answer..... If sympathetic system decreases motility and secr. of GI tract, why people have diarrhea when they are nervous (for example- right before taking Step 1 ) and if sympathetic system causes vasoconstriction, why boys turn red when they see a girl they like (and vice versa)? In both cases symp. system activated, so what's happening than????
I'd appreciate your replies.
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| Dr_C
Forum Newbie
Topics: 3
Posts: 26
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well bekind, the only thing i can try to answer is the first one, when u r stressed, sympathetic system fires so on GI that would be a decreased motility but the organism has to respond in order to lower sympathetic activity so it increases parasympathetic and decreases sympathetic which was an initial response then by activating and increasing parasympathetic you'll have an increased motility and relaxation of the sphincters. 
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