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21-12-2021
Biology

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A muscle contracts in response to an electrical signal that signals the ______________, the unit of contraction, to shorten.

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21-12-2021

Answer:

Sarcomere

Explanation:

A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction.

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