When a Student Nurse Asks the Nurse How the Cardiac

Multiple Choice

When a student nurse asks the nurse how the cardiac electrical impulse normally begins,what is the most correct response? The cardiac electrical impulse normally begins spontaneously in the sinoatrial (SA) node because it:

A) Has a superior location in the right atrium
B) Is the only area of the heart capable of spontaneous depolarization
C) Has rich sympathetic innervation via the vagus nerve
D) Depolarizes more rapidly than other automatic cells of the heart