Sympathetic nerves release the neurotransmitter _______, which speeds the heart rate and increases the strength of contraction.
A) dopamine
B) norepinephrine
C) acetylcholine
D) beta blocker

Question

Quizplus · Accepted Answer

Sympathetic nerves release norepinephrine, which is a neurotransmitter that activates the sympathetic response, leading to increased heart rate and cardiac output. Dopamine and acetylcholine are also neurotransmitters, but they do not have the same effect on the heart as norepinephrine. Beta blockers, on the other hand, block the effects of norepinephrine on the heart and are used to reduce heart rate and blood pressure.

Sympathetic Nerves Release the Neurotransmitter _______, Which Speeds the Heart