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The functional unit of a muscle fibre is the:

ASarcosome
BSarcomere
CSarcolemma
DSarcoplasm
Answer & Solution
Correct answer: B. Sarcomere
1. It is the repeating contractile segment. 2. Myofibrils are built from them. 3. The sarcomere is the functional unit of the muscle fiber. 4. So the answer is the sarcomere. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 10 'Muscle Tissue'_
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