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

Multiple Choice

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.