Norepinephrine has the following effect on pacemaker cells:
A)increased sodium influx.
B)increased potassium influx.
C)increased ATPase activity.
D)decreased calcium influx.

Question

Quizplus · Accepted Answer

Norepinephrine stimulates the sympathetic nervous system and enhances the activity of pacemaker cells by increasing the influx of sodium ions, leading to a positive chronotropic effect (increase in heart rate).

Norepinephrine Has the Following Effect on Pacemaker Cells