Home › NEET UG › biology › Locomotion and Movement › In the SLIDING FILAMENT theory of muscle contrac…
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.
Related questions
Tendons connect:SLOW-TWITCH (Type I, red) muscle fibres are characterised by:Cardiac muscle is unique because it is:The KNEE joint is an example of which type of synovial joint?The pectoral girdle in humans consists of:An adult human skeleton has approximately how many bones?RIGOR MORTIS (stiffness after death) occurs because:During muscle contraction, the immediate trigger for actin-myosin binding is the release o