Of the following statements concerning the sympathetic and parasympathetic branches of the nervous
system, which is true?
a. The sympathetic system controls external stimuli, while the parasympathetic system
controls internal stimuli.
b. The sympathetic system generally produces an increased physical activity, while the
parasympathetic system produces a decrease in physical activity.
c. Both nervous systems stimulate the activities of many organs.
d. Both nervous systems release norepinephrine.
e. The sympathetic system is under voluntary control, and the parasympathetic system is
under involuntary control.
B
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