Anatomy & PhysiologyCâu 67 / 100
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
Giải thích
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.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the inherent firing rate of the sinoatrial node in a healthy adult?
- A patient's SA node fails completely. Which structure normally takes over, and at what rate?
- What is the inherent rate of the Purkinje fibers, and what does a rhythm at that rate look like?
- Why does the impulse pause briefly at the AV node, and how does that pause appear on the EKG?
- What is depolarization?
- A student asks why an EKG can look normal in a patient whose heart is not pumping effectively. What is the best explanation?
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