alleryThe functional unit of a muscle fibril, lying between two successive Z-lines, is the
Asarcoplasm
Bsarcolemma
Csarcomere
Dmyofibril
Answer & Solution
Correct answer: C. sarcomere
1. A muscle fibril is built of repeating contractile units.
2. The portion between two successive Z-lines is one such unit.
3. That unit is called a sarcomere, and it is the functional unit of contraction.
4. Sarcolemma is the membrane and sarcoplasm the cytoplasm of the muscle fibre.
_Source: syllabus Biology Ch17 'Locomotion and Movement'_
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