________ are chemical substances that act as natural analgesics
A) Acetylcholines
B) Neurotransmitters
C) Endorphins
D) Receptors
C
Explanation: A) Acetylcholines are neurotransmitters.
B) Neurotransmitters facilitate a nerve impulse crossing a synapse.
C) Correct.
D) Receptors initiate a nerve impulse.
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