The heart rate of a vertebrate will decrease in response to the arrival of ________.
A) acetylcholine
B) endorphin
C) nitric oxide
D) gamma-aminobutyric acid (GABA)

Name: The heart rate of a vertebrate will decrease in response to the arrival of ________. A) acetylcholine B) endorphin C) nitric oxide D) gamma-aminobutyric acid (GABA)
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Question

Quizplus · Accepted Answer

Acetylcholine is a neurotransmitter that decreases heart rate by stimulating the parasympathetic nervous system, which slows down the heart's contractions.

The Heart Rate of a Vertebrate Will Decrease in Response