This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conducting System of Hea, Subject name: Physiology
During the T-P interval in an ECG of a patient with a damaged cardiac muscle, which of the following is true? 
Select and explain. 
A. The entire ventricle is depolarized, B. The entire ventricle is depolarized except for the damaged cardiac muscle, C. The entire ventricle is repolarized, D. The entire ventricle is repolarized except for the damaged cardiac muscle
D: The entire ventricle is repolarized except for the damaged cardiac muscle
Answer: D: The entire ventricle is repolarized except for the damaged cardiac muscle 
Explanation: During the T-P interval in a patient with a damaged ventricle, the only area depolarized is the damaged muscle. Therefore, the remainder of the ventricle is repolarized. At the J point, the entire ventricle is depolarized in a patient with a damaged cardiac muscle or in a patient with a normal cardiac muscle. The area of the hea that is damaged will not repolarize but remains depolarized at all times.