The following are structural components of the conducting system of the heart.
1) Purkinje fibers
2) AV bundle
3) AV node
4) SA node
5) bundle branches
The sequence in which excitation would move through this system is
A) 1, 4, 3, 2, 5.
B) 3, 2, 4, 5, 1.
C) 3, 5, 4, 2, 1.
D) 4, 3, 2, 5, 1.
E) 4, 2, 3, 5, 1.

Question

Quizplus · Accepted Answer

The correct sequence of excitation through the conducting system of the heart is SA node → AV node → AV bundle → bundle branches → Purkinje fibers. Therefore, choice D - 4, 3, 2, 5, 1 - is the correct sequence.

The Following Are Structural Components of the Conducting System of the Heart