Bodybuilders show off their muscles by
a. activating their autonomic nervous system.
b. willing the activation of their extensor muscles.
c. willing the activation of their flexor muscles.
d. simultaneously contracting their flexor and extensor muscles.
e. ingesting large amounts of sympathomimetic drugs.
Answer: d. simultaneously contracting their flexor and extensor muscles.
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Indicate whether the statement is true or false