MDCAT Physics MCQ #625

MDCAT Physics MCQ #625

1. Question 1

   Q1. When a person touches a live wire during a thunderstorm, what is the primary reason for the risk of cardiac arrest?

   • A) The electric current disrupts the functioning of the heart's pacemaker cells.
   • B) The external current interferes with the sinoatrial node's electrical signals.
   • C) The internal electric field generated by the current causes cardiac muscle depolarization.
   • D) The external electric field generated by the current causes cardiac muscle repolarization.

   Answer: The electric current disrupts the functioning of the heart's pacemaker cells.

   Explanation: The electric current can disrupt the functioning of the heart's pacemaker cells, leading to cardiac arrest.