Anatomy & Physiology第 67 / 100 题
What is the correct order of the cardiac electrical conduction pathway?
a.SA node, AV node, bundle of His, right and left bundle branches, Purkinje fibers
b.AV node, SA node, Purkinje fibers, bundle of His, bundle branches
c.SA node, bundle of His, AV node, Purkinje fibers, bundle branches
d.Purkinje fibers, bundle branches, bundle of His, AV node, SA node
解析
The impulse begins in the SA node, spreads across the atria to the AV node, passes through the bundle of His, splits into the right and left bundle branches, and ends in the Purkinje fibers that depolarize the ventricular muscle. Any sequence that starts at the AV node or the Purkinje fibers reverses normal physiology, and the bundle of His always lies below the AV node, never above it.
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