Which statement concerning the sympathetic and parasympathetic branches of the nervous system is true?
a. both nervous systems stimulate the activities of many organs.
b. both nervous systems release norepinephrine.
c. the sympathetic system generally produces increased physical activity, while the parasympathetic system produces a decrease in physical activity.
d. the sympathetic system controls external stimuli, while the parasympathetic system controls internal stimuli.

A. Both nervous system stimulate the activity of many organs.

Explanation: Both are related to the activity of many organs such as pupiles, blood pressure, bladder, etc.

The differences between them are that the sympathetic system generally produces an increase on the states of the organs, contrary to the parasympathetic that generally produces a decrease of the activity of the organs.

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