mdcat logical reasoning MCQ #948

mdcat logical reasoning MCQ #948

1. Question 1

   Q1. During a high-intensity exercise, a 16-year-old athlete's heart rate increases rapidly.

   • A) The sinoatrial node generates action potentials at the fastest rate.
   • B) The atrioventricular node increases the contraction rate of the ventricles.
   • C) The sympathetic nervous system stimulates the heart to pump more blood.
   • D) The parasympathetic nervous system slows down the heart rate.

   Answer: The sympathetic nervous system stimulates the heart to pump more blood.

   Explanation: The sympathetic nervous system stimulates the heart to pump more blood, increasing the heart rate.