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 answers.
A
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