Which statement is correct about a muscle contraction?
ATP causes fascicles to contract muscle fibers.
Sarcomeres produce actin and myosin.
Myosin heads attach to sites on actin filaments.
Myofibrils attach to Z lines.
ATP causes fascicles to contract muscle fibers.
Sarcomeres produce actin and myosin.
Myosin heads attach to sites on actin filaments.
Myofibrils attach to Z lines.