Sympathetic stimulation to the heart
A)decreases stroke volume.
B)increases heart rate.
C)causes bradycardia.
D)decreases cardiac output.

Question

Quizplus · Accepted Answer

Sympathetic stimulation to the heart increases heart rate by increasing the speed of depolarization and shortening the duration of the action potential. This is due to the release of norepinephrine from sympathetic nerve endings, which activates beta-adrenergic receptors on the heart. However, sympathetic stimulation does not decrease stroke volume or cause bradycardia, and its effect on cardiac output depends on the balance between heart rate and stroke volume.

Sympathetic Stimulation to the Heart