If the Muscles of a Weightlifter and a Marathon Runner

Question

If the muscles of a weightlifter and a marathon runner were compared,the marathon runner would have
A) more mitochondria in each muscle cell
B) larger muscle cells
C) more muscle cells
D) both A and C

Accepted Answer

Marathon runners rely heavily on aerobic respiration, which requires a large number of mitochondria to produce ATP. Weightlifters primarily use anaerobic respiration, which does not rely heavily on mitochondria. Therefore, the marathon runner would have more mitochondria in each muscle cell.