Multiple Choice
Which event occurs according to the sliding filament theory of muscle contraction?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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Within a sarcomere, the overlap of actin and myosin filaments produces which band?
A
Z band
B
I band
C
H band
D
A band
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the functional unit of a muscle fiber, consisting of actin (thin filaments) and myosin (thick filaments) arranged in a specific pattern.
Learn the definitions of the bands within a sarcomere: The Z band marks the boundary of each sarcomere, the I band contains only actin filaments, the H band contains only myosin filaments, and the A band is the region where actin and myosin filaments overlap.
Focus on the concept of filament overlap: The A band is the region within the sarcomere where actin and myosin filaments overlap, allowing for the sliding filament mechanism during muscle contraction.
Eliminate incorrect options: The Z band is the boundary, the I band contains only actin, and the H band contains only myosin. None of these involve filament overlap.
Conclude that the correct answer is the A band, as it is the region where actin and myosin filaments overlap within the sarcomere.
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