MDCAT Biology MCQ #2156

A patient's ECG shows a prolonged PR interval. Which process is being delayed?

MDCAT Biology MCQ #2156

  1. Question 1

    Q1. A patient's ECG shows a prolonged PR interval. Which process is being delayed?

    • A) Atrial depolarization
    • B) Ventricular depolarization
    • C) AV node conduction
    • D) SA node firing

    Answer: AV node conduction

    Explanation: PR interval represents time from SA node firing to ventricular depolarization; delay occurs in AV node.