mdcat logical reasoning MCQ #952

mdcat logical reasoning MCQ #952

1. Question 1

   Q1. During a marathon, a runner experiences muscle fatigue due to the accumulation of a specific ion.

   • A) The body loses water and electrolytes through sweat.
   • B) The sodium-potassium pump maintains the resting membrane potential.
   • C) Potassium ions accumulate in the muscle cells due to the breakdown of ATP.
   • D) Calcium ions trigger muscle contraction by binding to troponin.

   Answer: Potassium ions accumulate in the muscle cells due to the breakdown of ATP.

   Explanation: Potassium ions accumulate in the muscle cells due to the breakdown of ATP, causing muscle fatigue.