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25 February, 15:40

One sarcomere a. extends from Z line to Z line. b. is composed of many myofibrils. c. contains only actin fibers. d. is composed of many muscle fibers. e. surrounds each muscle in the body.

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  1. 25 February, 18:38
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    a. extends from Z line to Z line.

    Explanation:

    A sarcomere refers to the region between two consecutive Z lines. Sarcomere serves as functional units in skeletal muscles as the shortening of individual sarcomeres results in shortening of myofibrils and muscle cells.

    Each sarcomere extends from one Z line to the next one and consists of one complete A band and two half parts of an I band. The two halves of the I band are present one either side of A band in a sarcomere.
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