What process increases the size of a muscle?
A) increased muscle cell division
B) addition of muscle companion cells
C) stretching of individual muscle cells
D) synthesis of new protein filaments
E) more than one of these

Question

Quizplus · Accepted Answer

Muscle growth, or hypertrophy, is caused by an increase in the size of individual muscle cells, not an increase in the number of cells. This increase in size is due to the synthesis of new protein filaments within the muscle cells. Stretching and the presence of companion cells may play supporting roles, but the primary process that increases muscle size is the synthesis of new protein filaments.

What Process Increases the Size of a Muscle