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The dark band of a muscle fibril, containing myosin, is called the

AI-band
BA-band
CZ-line
Dsarcolemma
Answer & Solution
Correct answer: B. A-band
1. The two band types are distinguished by which filament they contain. 2. The light I-band contains actin filaments. 3. The dark band contains myosin filaments and is the A-band, or anisotropic band. 4. The Z-line and the sarcolemma are structural boundaries rather than bands. _Source: syllabus Biology Ch17 'Locomotion and Movement'_
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