Which of the following is a chemical agent utilized within the autonomic nervous system?
a. histamine c. levonorgestrel
b. norepinephrine d. methylxanthine
ANS: B
Feedback
A Incorrect: This is not an ANS neurotransmitter.
B Correct: Norepinephrine and acetylcholine are the ANS neurotransmitters.
C Incorrect: This is not an ANS neurotransmitter.
D Incorrect: This is not an ANS neurotransmitter.
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