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

Verified
Correct Answer:
Verified
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