Brandon loves to spend many hours per week in the weight room, and he is quite muscular. Brandon's muscles have enlarged as a result of
A) scar tissue.
B) the breakdown of sarcomeres and Z lines.
C) the production of more troponin.
D) the production of more actin and myosin filaments.

Question

Quizplus · Accepted Answer

Actin and myosin filaments are the proteins responsible for muscle contraction. With increased weightlifting and exercise, the body responds by producing more of these proteins, leading to enlarged muscles. Scar tissue does not contribute to muscle growth, and the breakdown of sarcomeres and Z lines would actually result in muscle wasting rather than enlargement. While troponin is also involved in muscle contraction, it is not directly related to muscle growth.

Brandon Loves to Spend Many Hours Per Week in the Weight