Multiple Choice
_____ is a neurotransmitter that slows down heart rate, whereas _____ speeds it up.
A) Acetylcholine; norepinephrine
B) Epinephrine; norepinephrine
C) Norepinephrine; acetylcholine
D) Epinephrine; acetylcholine
Correct Answer:
Verified
Correct Answer:
Verified
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