Automatic electrical discharges in the myocardium normally begin within which of the following?
A) Bundle of His
B) Sinoatrial node
C) Bachmann's bundle
D) Atrioventricular node

Question

Quizplus · Accepted Answer

The sinoatrial node ,as well as the atrioventricular node,normally have action potentials that differ from those of other excitable cells of the heart.Depolarization of the sinoatrial node initiates the heartbeat by triggering a wave of excitation that spreads through the right and left atria as it moves toward the atrioventricular node.

Automatic Electrical Discharges in the Myocardium Normally Begin Within Which