which of the following contains overlapping thick and thin filaments
Mechanisms of Contraction. I. Skeletal muscle cells, or fibers, contain structures called myofibrils. A. Each myofibril is striated with dark (A) and light (I) bands; there are Z lines in the middle of each I band. B. The A bands contain thick filaments, composed primarily of myosin. 1. The edges of each A band also contain thin filaments, which overlap with the thick filaments.