For a person to make a fist, which of the following must occur?
a. The central nervous system must send a message through the spinal cord and then through the peripheral nerves.
b. The central nervous system must send a message through the spinal cord and then through the autonomic nervous system.
c. The peripheral nervous system must send a message to the brain and then back through the peripheral nervous system.
d. The muscles must signal the brain to send a message through the autonomic nervous system.
Answer: a
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