Multiple Choice
During a muscle contraction, what happens to the actin and myosin filaments according to the sliding filament theory?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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What is the letter associated with the dark bands in a sarcomere?
A
A band
B
Z line
C
I band
D
H zone
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of repeating sections of actin and myosin filaments.
Identify the components of a sarcomere: The sarcomere is divided into different bands and zones, including the A band, I band, H zone, and Z line.
Define the A band: The A band is the dark band in a sarcomere, where thick myosin filaments overlap with thin actin filaments.
Differentiate between the bands: The I band is lighter and contains only thin actin filaments, while the H zone is a lighter region within the A band where only myosin filaments are present.
Conclude with the correct association: The dark bands in a sarcomere are associated with the A band, as it contains the overlapping region of actin and myosin filaments, giving it a darker appearance under a microscope.
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