Myofibrils has thousands of fibers of protein actin (thin) and myosin (thick), arranged so that can interdigitate between them, to cause contraction. The fundamental unit of contraction is called sarcomeres (photo). Has a relaxed sarcomere actin fibers further apart, one has contracted sarcomere actin fibers closer together horizontally. The limit a sarcomere Z lines and separated from other sarcomeres. Banda
A: corresponds to the width of the myosin fibers
Banda H: is the separation between the actin filaments
Banda I: corresponds to the width between the Z line and M-band
Line: corresponds to a clamping central fiber myosin
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