Galvani's experiment involving a frog leg proved that
a. the heart is the organ that controls emotions.
b. the muscles are activated by electrical nerve signals.
c. unlike animals, human bodies do not possess reflexes.
d. a reflex is a process controlled by the mind.
e. the pineal gland pushes fluid through nerves into the muscles.
Answer: b. the muscles are activated by electrical nerve signals.
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