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(A) Skeletal muscles are responsible for voluntary movements under the conscious control of the brain,hence they are called voluntary muscles.Each mus

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Sarcomere

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(A) Skeletal muscles are responsible for voluntary movements under the conscious control of the brain,hence they are called voluntary muscles.Each muscle fiber contains many parallel filaments called myofibrils.The segment of a myofibril located between two adjacent $Z$-lines (or $Z$-bands) is known as a sarcomere.The sarcomere is considered the functional unit of contraction in skeletal muscle because it contains the contractile proteins,actin and myosin,arranged in a specific pattern that allows for muscle shortening.

The functional unit of skeletal muscle is called:

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