MDCAT Physics MCQ #630

A person uses a defibrillator to restore a normal heartbeat during a cardiac arrest. What is the primary mechanism of the defibrillator's action?

MDCAT Physics MCQ #630

  1. Question 1

    Q1. A person uses a defibrillator to restore a normal heartbeat during a cardiac arrest. What is the primary mechanism of the defibrillator's action?

    • A) The defibrillator generates an electrical signal that stimulates the sinoatrial node to fire.
    • B) The defibrillator generates an electrical signal that blocks the sinoatrial node's natural firing.
    • C) The defibrillator generates an electrical signal that modulates the release of neurotransmitters involved in heart rhythm regulation.
    • D) The defibrillator generates an electrical signal that disrupts the abnormal electrical activity in the heart.

    Answer: The defibrillator generates an electrical signal that disrupts the abnormal electrical activity in the heart.

    Explanation: The defibrillator generates an electrical signal that disrupts the abnormal electrical activity in the heart, allowing a normal heartbeat to resume.