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Skeletal muscle - high mag.
Striated muscle appears banded due to alternating dark A bands and light I bands. I bands are divided by Z lines. A sarcomere runs from one Z line to the next. A series of sarcomeres that run the length of the muscle fiber is called a myofibril. The A band is divided by the H band which in turn is divided by the M line. The H band is the region where only myosin exists. The I band is the region where only actin exists.