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In the SLIDING FILAMENT theory of muscle contraction:
ABoth actin and myosin filaments shorten significantly
BActin filaments slide over myosin (filaments don't shorten)
CSarcomeres expand to lengthen the muscle
DOnly the muscle membrane shortens, not the filaments
Answer & Solution
Correct answer: B. Actin filaments slide over myosin (filaments don't shorten)
Sliding filament theory (H. Huxley + A. Huxley, 1954): muscle CONTRACTS as actin filaments SLIDE OVER myosin filaments, shortening the SARCOMERE. The filaments themselves DO NOT shorten. Z-lines move closer together; I-band + H-zone shorten; A-band stays the same.
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