Which of the following would increase heart rate?
A)increased sympathetic stimulation of SA node
B)decreased parasympathetic stimulation of nodal fibers
C)increased levels of epinephrine
D)faster depolarization of the pacemaker potential
E)All of the answers are correct.

Question

Quizplus · Accepted Answer

All of the given options are correct and can increase heart rate. Increased sympathetic stimulation of SA node and decreased parasympathetic stimulation of nodal fibers both increase the depolarization rate of pacemaker cells leading to increased heart rate. Epinephrine is a hormone that is released by the adrenal gland during the fight or flight response which increases heart rate. Faster depolarization of the pacemaker potential is also a factor that can lead to increased heart rate.

Which of the Following Would Increase Heart Rate