Which cardiac cells are responsible for initiating and conducting pacemaker impulses?
A) Motor cells
B) Mechanical cells
C) Electrical cells
D) Atrioventricular cells
Question 2
When stimulated, the ________ branch of the nervous system increases heart rate, AV conduction, and irritability.
A) parasympathetic
B) sympathetic
C) pacemaker
D) inherent
