Multiple Choice
Three types of chemical messengers are:
A) excitatory neurotransmitters,inhibitory neurotransmitters,and hormones.
B) neurotransmitters,endorphins,and hormones.
C) excitatory neurotransmitters,inhibitory neurotransmitters,and endorphins.
D) sodium,potassium,and neurotransmitters.
Correct Answer:

Verified
Correct Answer:
Verified
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