In general the actions the
sympathetic and the
are antagonistic,i.e., while one
something the other inhibits
vice versa. The organs, few
exceptions, get efferences these
two systems and antagonism
between them serves modulate their
effects.For example,
parasympathetic stimulates salivation
while sympathetic inhibits it; the
constricts pupils while
the dilates it; the
parasympathetic the bronchi
while the relaxes them; the
parasympathetic the genital
organs while parasympathetic
inhibits the excitation.