Which is the normal sequence of the spread of cardiac excitation?
1 . AV node
2 . SA node
3 . atria
4 . Purkinje fibers
5 . bundle of His
6 . ventricular myocardium
a. 2->3->1->5->4->6
b. 3->2->1->4->5->6
c. 2->3->1->4->5->6
d. 1->2->3->4->5->6
e. none of these
A
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