When a person "works out"with weights, their muscles typically grow. This growth is due to increases in the number of myofibrils within their muscle fibers.

Question

Quizplus · Accepted Answer

When a person engages in resistance training or works out with weights, their muscles grow through a process called hypertrophy, which involves an increase in the size of muscle fibers. This growth is primarily due to an increase in the number and size of myofibrils, the contractile units within muscle fibers, leading to larger and stronger muscles.

When a Person "Works Out"with Weights, Their Muscles Typically Grow