Through which structures do conduction impulses pass,in sequential order,causing the heart to contract?
A) SA node,AV node,bundle of His,Purkinje fibers
B) AV node,SA node,AV bundle,Purkinje fibers
C) AV bundle,AV node,SA node,Purkinje fibers
D) Purkinje fibers,SA node,AV node,AV bundle
E) Purkinje fibers,AV node,SA node,AV bundle

Question

Quizplus · Accepted Answer

The normal sequence of impulse conduction in the heart is initiated at the SA node, then transmitted to the AV node, then down the bundle of His, and finally into the Purkinje fibers, which stimulate contraction of the ventricles. Choice A provides the correct sequential order of these structures.

Through Which Structures Do Conduction Impulses Pass,in Sequential Order,causing the Heart