Which of the following statements is true?
a. Organs receive either parasympathetic fibers or
sympathetic fibers but not both.
b. The sympathetic nervous system that supplies an
organ will also provide parasympathetic fibers to
it.
c. Both the sympathetic and parasympathetic have
either excitatory or inhibitory effects.
d. The sympathetic branch of the sympathetic
system usually speeds up the activities of the
body.
e. All of these are true.
Answer: d
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