What is the normal sequence of the spread of cardiac excitation
A)SA node, atria, AV node, bundle of His, Purkinje fibres, ventricular myocardium
B)Atria, SA node, AV node, Purkinje fibres, bundle of His, ventricular myocardium
C)SA node, atria, AV node, Purkinje fibres, bundle of His, ventricular myocardium
D)AV node, SA node, Atria, Purkinje fibres, bundle of His, ventricular myocardium

Question

Quizplus · Accepted Answer

The normal sequence of cardiac excitation starts at the sinoatrial (SA) node, then spreads through the atria, moves to the atrioventricular (AV) node, continues through the bundle of His, spreads into the Purkinje fibers, and finally reaches the ventricular myocardium. This sequence ensures the coordinated contraction of the heart chambers for efficient blood pumping.

What Is the Normal Sequence of the Spread of Cardiac