Enkephalins and endorphins are
a. neuromodulators.
b. stimulators of brain and nervous activity.
c. inhibitors of pain perception.
d. neuromodulators and stimulators of brain and
nervous activity.
e. neuromodulators and inhibitors of pain
perception
Answer: e
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a. at least one cell b. a nucleus c. a cell wall d. mitochondria e. oxygen
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Fill in the blank(s) with the appropriate word(s).