Answer
Hardly. Muscle cells do not multiply or proliferate in an adult. However, they can grow larger (hypertrophy) and stronger. This is what is happening to Jamal's muscle cells. In stressed muscles, the myofibers increase their capacity to store glycogen; this enhances the length of time during which they can contract before resting.
Work Step by Step
Muscle fibers can split longitudinally and the myofibrils can increase in diameter.. Under stress myofibers produce more mitochondria and increase in size of thick and thin filaments ; more fast glycolytic fibers (FG) may develop at the expense of fast glycolytic oxidative (FOG) fibers.
Stressed muscles also develop more connective tissues. but the muscles of adult definitely do not undergo hyperplasia/mitosis.
