MDCAT Physics MCQ #629

MDCAT Physics MCQ #629

1. Question 1

   Q1. A person experiences a severe electric shock during a lightning strike. What is the primary effect on the body?

   • 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 internal electric field generated by the current causes cardiac muscle depolarization.

   Explanation: The internal electric field generated by the current causes cardiac muscle depolarization, leading to cardiac arrest.