試題詳解

56. What is the order of the control of heart rhythm? 1. Signals are delayed at AV node. 2. Bundle branches pass signals to heart apex. 3. Signals from SA node spread. 4. Signals spread throughout ventricles.
(A) 3 → 4 → 2 → 1
(B) 4 → 1 → 3 → 2
(C) 3 → 1 → 2 → 4
(D) 2 → 1 → 4 → 3
(E) 2 → 3 → 4 → 1