How does the arrangement of thick and thin filaments contribute to muscle contraction?
A. Thin filaments elongate to accommodate muscle contraction.
B. The sliding of thin filaments past thick filaments shortens the sarcomere.
C. Thick filaments pull apart from each other during contraction.
D. Thick and thin filaments contract simultaneously, pulling muscle fibers together.
Answer (1)
The arrangement of thick and thin filaments in muscle fibers is crucial for contraction, primarily through the sliding filament theory. This process shortens the sarcomere as thin filaments slide past thick filaments. Therefore, option (B) is the correct explanation of this mechanism. ;
