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

User Kudos
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Answer:

Sarcomere

Step-by-step 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.

User Emeka Augustine
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